mirror of
https://github.com/k3s-io/kubernetes.git
synced 2025-07-22 11:21:47 +00:00
Register the kubelet on the master node with an apiserver. This option is
separated from the apiserver running locally on the master node so that it can be optionally enabled or disabled as needed. Also, fix the healthchecking configuration for the master components, which was previously only working by coincidence: If a kubelet doesn't register with a master, it never bothers to figure out what its local address is. In which case it ends up constructing a URL like http://:8080/healthz for the http probe. This happens to work on the master because all of the pods are using host networking and explicitly binding to 127.0.0.1. Once the kubelet is registered with the master and it determines the local node address, it tries to healthcheck on an address where the pod isn't listening and the kubelet periodically restarts each master component when the liveness probe fails.
This commit is contained in:
parent
1407aee8b0
commit
8df33bc1a7
@ -25,6 +25,7 @@ MASTER_DISK_TYPE=pd-ssd
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MASTER_DISK_SIZE=${MASTER_DISK_SIZE:-20GB}
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MINION_DISK_TYPE=pd-standard
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MINION_DISK_SIZE=${MINION_DISK_SIZE:-100GB}
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REGISTER_MASTER_KUBELET=${REGISTER_MASTER:-true}
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OS_DISTRIBUTION=${KUBE_OS_DISTRIBUTION:-debian}
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MASTER_IMAGE=${KUBE_GCE_MASTER_IMAGE:-container-vm-v20150715}
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@ -25,6 +25,7 @@ MASTER_DISK_TYPE=pd-ssd
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MASTER_DISK_SIZE=${MASTER_DISK_SIZE:-20GB}
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MINION_DISK_TYPE=pd-standard
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MINION_DISK_SIZE=${MINION_DISK_SIZE:-100GB}
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REGISTER_MASTER_KUBELET=${REGISTER_MASTER:-false}
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KUBE_APISERVER_REQUEST_TIMEOUT=300
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OS_DISTRIBUTION=${KUBE_OS_DISTRIBUTION:-debian}
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@ -358,13 +358,35 @@ function create-salt-master-auth() {
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fi
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}
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# This should happen only on cluster initialization. After the first boot
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# and on upgrade, the kubeconfig file exists on the master-pd and should
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# never be touched again.
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#
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# - Uses KUBELET_CA_CERT (falling back to CA_CERT), KUBELET_CERT, and
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# KUBELET_KEY to generate a kubeconfig file for the kubelet to securely
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# connect to the apiserver.
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function create-salt-master-kubelet-auth() {
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# Only configure the kubelet on the master if the required variables are
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# set in the environment.
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if [[ ! -z "${KUBELET_APISERVER:-}" ]] && [[ ! -z "${KUBELET_CERT:-}" ]] && [[ ! -z "${KUBELET_KEY:-}" ]]; then
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create-salt-kubelet-auth
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fi
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}
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# This should happen both on cluster initialization and node upgrades.
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#
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# - Uses CA_CERT, KUBELET_CERT, and KUBELET_KEY to generate a kubeconfig file
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# for the kubelet to securely connect to the apiserver.
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# - Uses KUBELET_CA_CERT (falling back to CA_CERT), KUBELET_CERT, and
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# KUBELET_KEY to generate a kubeconfig file for the kubelet to securely
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# connect to the apiserver.
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function create-salt-kubelet-auth() {
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local -r kubelet_kubeconfig_file="/srv/salt-overlay/salt/kubelet/kubeconfig"
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if [ ! -e "${kubelet_kubeconfig_file}" ]; then
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# If there isn't a CA certificate set specifically for the kubelet, use
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# the cluster CA certificate.
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if [[ -z "${KUBELET_CA_CERT:-}" ]]; then
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KUBELET_CA_CERT="${CA_CERT}"
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fi
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mkdir -p /srv/salt-overlay/salt/kubelet
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(umask 077;
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cat > "${kubelet_kubeconfig_file}" <<EOF
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@ -378,7 +400,7 @@ users:
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clusters:
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- name: local
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cluster:
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certificate-authority-data: ${CA_CERT}
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certificate-authority-data: ${KUBELET_CA_CERT}
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contexts:
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- context:
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cluster: local
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@ -493,7 +515,6 @@ function salt-master-role() {
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grains:
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roles:
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- kubernetes-master
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cbr-cidr: ${MASTER_IP_RANGE}
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cloud: gce
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EOF
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if ! [[ -z "${PROJECT_ID:-}" ]] && ! [[ -z "${TOKEN_URL:-}" ]] && ! [[ -z "${NODE_NETWORK:-}" ]] ; then
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@ -508,6 +529,21 @@ EOF
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cloud_config: /etc/gce.conf
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advertise_address: '${EXTERNAL_IP}'
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proxy_ssh_user: '${PROXY_SSH_USER}'
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EOF
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fi
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# If the kubelet on the master is enabled, give it the same CIDR range
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# as a generic node.
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if [[ ! -z "${KUBELET_APISERVER:-}" ]] && [[ ! -z "${KUBELET_CERT:-}" ]] && [[ ! -z "${KUBELET_KEY:-}" ]]; then
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cat <<EOF >>/etc/salt/minion.d/grains.conf
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kubelet_api_servers: '${KUBELET_APISERVER}'
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cbr-cidr: 10.123.45.0/30
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EOF
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else
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# If the kubelet is running disconnected from a master, give it a fixed
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# CIDR range.
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cat <<EOF >>/etc/salt/minion.d/grains.conf
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cbr-cidr: ${MASTER_IP_RANGE}
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EOF
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fi
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}
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@ -519,6 +555,7 @@ grains:
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- kubernetes-pool
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cbr-cidr: 10.123.45.0/30
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cloud: gce
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api_servers: '${KUBERNETES_MASTER_NAME}'
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EOF
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}
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@ -536,12 +573,6 @@ EOF
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fi
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}
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function salt-set-apiserver() {
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cat <<EOF >>/etc/salt/minion.d/grains.conf
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api_servers: '${KUBERNETES_MASTER_NAME}'
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EOF
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}
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function configure-salt() {
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fix-apt-sources
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mkdir -p /etc/salt/minion.d
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@ -554,7 +585,6 @@ function configure-salt() {
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else
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salt-node-role
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salt-docker-opts
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salt-set-apiserver
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fi
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install-salt
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stop-salt-minion
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@ -577,6 +607,7 @@ if [[ -z "${is_push}" ]]; then
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create-salt-pillar
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if [[ "${KUBERNETES_MASTER}" == "true" ]]; then
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create-salt-master-auth
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create-salt-master-kubelet-auth
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else
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create-salt-kubelet-auth
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create-salt-kubeproxy-auth
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@ -59,8 +59,11 @@ RKT_VERSION: $(yaml-quote ${RKT_VERSION})
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CA_CERT: $(yaml-quote ${CA_CERT_BASE64})
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MASTER_CERT: $(yaml-quote ${MASTER_CERT_BASE64:-})
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MASTER_KEY: $(yaml-quote ${MASTER_KEY_BASE64:-})
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KUBELET_CERT: $(yaml-quote ${KUBELET_CERT_BASE64:-})
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KUBELET_KEY: $(yaml-quote ${KUBELET_KEY_BASE64:-})
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KUBECFG_CERT: $(yaml-quote ${KUBECFG_CERT_BASE64:-})
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KUBECFG_KEY: $(yaml-quote ${KUBECFG_KEY_BASE64:-})
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KUBELET_APISERVER: $(yaml-quote ${KUBELET_APISERVER:-})
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EOF
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else
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cat >>$file <<EOF
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@ -49,6 +49,8 @@ KUBE_PROXY_TOKEN: $(yaml-quote ${KUBE_PROXY_TOKEN:-})
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ADMISSION_CONTROL: $(yaml-quote ${ADMISSION_CONTROL:-})
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MASTER_IP_RANGE: $(yaml-quote ${MASTER_IP_RANGE})
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CA_CERT: $(yaml-quote ${CA_CERT_BASE64:-})
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KUBELET_CERT: $(yaml-quote ${KUBELET_CERT_BASE64:-})
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KUBELET_KEY: $(yaml-quote ${KUBELET_KEY_BASE64:-})
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EOF
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if [ -n "${KUBE_APISERVER_REQUEST_TIMEOUT:-}" ]; then
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cat >>$file <<EOF
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@ -66,6 +68,7 @@ MASTER_CERT: $(yaml-quote ${MASTER_CERT_BASE64:-})
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MASTER_KEY: $(yaml-quote ${MASTER_KEY_BASE64:-})
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KUBECFG_CERT: $(yaml-quote ${KUBECFG_CERT_BASE64:-})
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KUBECFG_KEY: $(yaml-quote ${KUBECFG_KEY_BASE64:-})
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KUBELET_APISERVER: $(yaml-quote ${KUBELET_APISERVER:-})
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EOF
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if [ -n "${APISERVER_TEST_ARGS:-}" ]; then
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cat >>$file <<EOF
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@ -93,8 +96,6 @@ EOF
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KUBERNETES_MASTER: "false"
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ZONE: $(yaml-quote ${ZONE})
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EXTRA_DOCKER_OPTS: $(yaml-quote ${EXTRA_DOCKER_OPTS:-})
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KUBELET_CERT: $(yaml-quote ${KUBELET_CERT_BASE64:-})
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KUBELET_KEY: $(yaml-quote ${KUBELET_KEY_BASE64:-})
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EOF
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if [ -n "${KUBELET_TEST_ARGS:-}" ]; then
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cat >>$file <<EOF
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@ -487,6 +487,11 @@ function yaml-quote {
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}
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function write-master-env {
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# If the user requested that the master be part of the cluster, set the
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# environment variable to program the master kubelet to register itself.
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if [[ "${REGISTER_MASTER_KUBELET:-}" == "true" ]]; then
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KUBELET_APISERVER="${MASTER_NAME}"
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fi
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build-kube-env true "${KUBE_TEMP}/master-kube-env.yaml"
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}
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@ -1,7 +1,10 @@
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{
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"apiVersion": "v1",
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"kind": "Pod",
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"metadata": {"name":"etcd-server"},
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"metadata": {
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"name":"etcd-server",
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"namespace": "kube-system"
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},
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"spec":{
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"hostNetwork": true,
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"containers":[
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@ -99,7 +99,10 @@
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{
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"apiVersion": "v1",
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"kind": "Pod",
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"metadata": {"name":"kube-apiserver"},
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"metadata": {
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"name":"kube-apiserver",
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"namespace": "kube-system"
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},
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"spec":{
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"hostNetwork": true,
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"containers":[
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@ -118,8 +121,9 @@
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],
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"livenessProbe": {
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"httpGet": {
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"path": "/healthz",
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"port": 8080
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"host": "127.0.0.1",
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"port": 8080,
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"path": "/healthz"
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},
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"initialDelaySeconds": 15,
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"timeoutSeconds": 15
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@ -44,7 +44,10 @@
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{
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"apiVersion": "v1",
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"kind": "Pod",
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"metadata": {"name":"kube-controller-manager"},
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"metadata": {
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"name":"kube-controller-manager",
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"namespace": "kube-system"
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},
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"spec":{
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"hostNetwork": true,
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"containers":[
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@ -63,8 +66,9 @@
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],
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"livenessProbe": {
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"httpGet": {
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"path": "/healthz",
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"port": 10252
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"host": "127.0.0.1",
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"port": 10252,
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"path": "/healthz"
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},
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"initialDelaySeconds": 15,
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"timeoutSeconds": 15
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@ -8,7 +8,10 @@
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{
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"apiVersion": "v1",
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"kind": "Pod",
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"metadata": {"name":"kube-scheduler"},
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"metadata": {
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"name":"kube-scheduler",
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"namespace": "kube-system"
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},
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"spec":{
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"hostNetwork": true,
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"containers":[
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@ -27,8 +30,9 @@
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],
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"livenessProbe": {
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"httpGet": {
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"path": "/healthz",
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"port": 10251
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"host": "127.0.0.1",
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"port": 10251,
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"path": "/healthz"
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},
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"initialDelaySeconds": 15,
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"timeoutSeconds": 15
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@ -22,15 +22,22 @@
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{% set api_servers_with_port = api_servers + ":6443" -%}
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{% endif -%}
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# Disable registration for the kubelet running on the master on AWS, GCE, Vagrant. Also disable
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# the debugging handlers (/run and /exec) to prevent arbitrary code execution on
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# the master.
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# TODO(roberthbailey): Make this configurable via an env var in config-default.sh
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{% set debugging_handlers = "--enable-debugging-handlers=true" -%}
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{% if grains.cloud in ['aws', 'gce', 'vagrant'] -%}
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{% if grains['roles'][0] == 'kubernetes-master' -%}
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{% set api_servers_with_port = "" -%}
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{% if grains['roles'][0] == 'kubernetes-master' -%}
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{% if grains.cloud in ['aws', 'gce', 'vagrant'] -%}
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# Unless given a specific directive, disable registration for the kubelet
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# running on the master.
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{% if grains.kubelet_api_servers is defined -%}
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{% set api_servers_with_port = "--api_servers=https://" + grains.kubelet_api_servers -%}
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{% else -%}
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{% set api_servers_with_port = "" -%}
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{% endif -%}
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# Disable the debugging handlers (/run and /exec) to prevent arbitrary
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# code execution on the master.
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# TODO(roberthbailey): Relax this constraint once the master is self-hosted.
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{% set debugging_handlers = "--enable-debugging-handlers=false" -%}
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{% endif -%}
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{% endif -%}
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@ -88,7 +95,7 @@
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{% set pod_cidr = "" %}
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{% if grains['roles'][0] == 'kubernetes-master' and grains.get('cbr-cidr') %}
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{% set pod_cidr = "--pod-cidr=" + grains['cbr-cidr'] %}
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{% endif %}
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{% endif %}
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{% set test_args = "" -%}
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{% if pillar['kubelet_test_args'] is defined -%}
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@ -19,9 +19,9 @@
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- group: root
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- mode: 755
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# The default here is that this file is blank. If this is the case, the kubelet
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# won't be able to parse it as JSON and will try to use the kubernetes_auth file
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# instead. You'll see a single error line in the kubelet start up file
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# The default here is that this file is blank. If this is the case, the kubelet
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# won't be able to parse it as JSON and it will not be able to publish events
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# to the apiserver. You'll see a single error line in the kubelet start up file
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# about this.
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/var/lib/kubelet/kubeconfig:
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file.managed:
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@ -31,19 +31,6 @@
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- mode: 400
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- makedirs: true
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#
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# --- This file is DEPRECATED ---
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# The default here is that this file is blank. If this is the case, the kubelet
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# won't be able to parse it as JSON and it'll not be able to publish events to
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# the apiserver. You'll see a single error line in the kubelet start up file
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# about this.
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/var/lib/kubelet/kubernetes_auth:
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file.managed:
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- source: salt://kubelet/kubernetes_auth
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- user: root
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- group: root
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- mode: 400
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- makedirs: true
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{% if pillar.get('is_systemd') %}
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@ -64,7 +51,7 @@ fix-service-kubelet:
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- file: /usr/local/bin/kubelet
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- file: {{ pillar.get('systemd_system_path') }}/kubelet.service
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- file: {{ environment_file }}
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- file: /var/lib/kubelet/kubernetes_auth
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- file: /var/lib/kubelet/kubeconfig
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{% else %}
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@ -91,4 +78,4 @@ kubelet:
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- file: /usr/lib/systemd/system/kubelet.service
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{% endif %}
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- file: {{ environment_file }}
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- file: /var/lib/kubelet/kubernetes_auth
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- file: /var/lib/kubelet/kubeconfig
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@ -27,6 +27,10 @@ source "${KUBE_ROOT}/cluster/kube-util.sh"
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MINIONS_FILE=/tmp/minions-$$
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trap 'rm -rf "${MINIONS_FILE}"' EXIT
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EXPECTED_NUM_NODES="${NUM_MINIONS}"
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if [[ "${REGISTER_MASTER_KUBELET:-}" == "true" ]]; then
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EXPECTED_NUM_NODES=$((EXPECTED_NUM_NODES+1))
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fi
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# Make several attempts to deal with slow cluster birth.
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attempt=0
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while true; do
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@ -38,20 +42,24 @@ while true; do
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# Echo the output, strip the first line, then gather 2 counts:
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# - Total number of nodes.
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# - Number of "ready" nodes.
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"${KUBE_ROOT}/cluster/kubectl.sh" get nodes > "${MINIONS_FILE}" || true
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#
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# Suppress errors from kubectl output because during cluster bootstrapping
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# for clusters where the master node is registered, the apiserver will become
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# available and then get restarted as the kubelet configures the docker bridge.
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"${KUBE_ROOT}/cluster/kubectl.sh" get nodes > "${MINIONS_FILE}" 2> /dev/null || true
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found=$(cat "${MINIONS_FILE}" | sed '1d' | grep -c .) || true
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ready=$(cat "${MINIONS_FILE}" | sed '1d' | awk '{print $NF}' | grep -c '^Ready') || true
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if (( ${found} == "${NUM_MINIONS}" )) && (( ${ready} == "${NUM_MINIONS}")); then
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if (( "${found}" == "${EXPECTED_NUM_NODES}" )) && (( "${ready}" == "${EXPECTED_NUM_NODES}")); then
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break
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else
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# Set the timeout to ~10minutes (40 x 15 second) to avoid timeouts for 100-node clusters.
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if (( attempt > 40 )); then
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echo -e "${color_red}Detected ${ready} ready nodes, found ${found} nodes out of expected ${NUM_MINIONS}. Your cluster may not be working.${color_norm}"
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echo -e "${color_red}Detected ${ready} ready nodes, found ${found} nodes out of expected ${EXPECTED_NUM_NODES}. Your cluster may not be working.${color_norm}"
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cat -n "${MINIONS_FILE}"
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exit 2
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else
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echo -e "${color_yellow}Waiting for ${NUM_MINIONS} ready nodes. ${ready} ready nodes, ${found} registered. Retrying.${color_norm}"
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echo -e "${color_yellow}Waiting for ${EXPECTED_NUM_NODES} ready nodes. ${ready} ready nodes, ${found} registered. Retrying.${color_norm}"
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fi
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attempt=$((attempt+1))
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sleep 15
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@ -1,7 +1,10 @@
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{
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"apiVersion": "v1",
|
||||
"kind": "Pod",
|
||||
"metadata": {"name":"kube-apiserver"},
|
||||
"metadata": {
|
||||
"name":"kube-apiserver",
|
||||
"namespace": "kube-system"
|
||||
},
|
||||
"spec":{
|
||||
"hostNetwork": true,
|
||||
"containers":[
|
||||
@ -13,6 +16,15 @@
|
||||
"-c",
|
||||
"/usr/local/bin/kube-apiserver --address=0.0.0.0 --etcd_servers=http://kube0.ha:2379 --service-cluster-ip-range=10.0.0.0/16 --v=4 --allow_privileged=True 1>>/var/log/kube-apiserver.log 2>&1"
|
||||
],
|
||||
"livenessProbe": {
|
||||
"httpGet": {
|
||||
"host": "127.0.0.1",
|
||||
"port": 8080,
|
||||
"path": "/healthz"
|
||||
},
|
||||
"initialDelaySeconds": 15,
|
||||
"timeoutSeconds": 15
|
||||
},
|
||||
"ports":[
|
||||
{ "name": "https",
|
||||
"containerPort": 443,
|
||||
|
@ -1,7 +1,10 @@
|
||||
{
|
||||
"apiVersion": "v1",
|
||||
"kind": "Pod",
|
||||
"metadata": {"name":"kube-controller-manager"},
|
||||
"metadata": {
|
||||
"name":"kube-controller-manager",
|
||||
"namespace": "kube-system"
|
||||
},
|
||||
"spec":{
|
||||
"hostNetwork": true,
|
||||
"containers":[
|
||||
@ -15,8 +18,9 @@
|
||||
],
|
||||
"livenessProbe": {
|
||||
"httpGet": {
|
||||
"path": "/healthz",
|
||||
"port": 10252
|
||||
"host": "127.0.0.1",
|
||||
"port": 10252,
|
||||
"path": "/healthz"
|
||||
},
|
||||
"initialDelaySeconds": 15,
|
||||
"timeoutSeconds": 1
|
||||
|
@ -1,7 +1,10 @@
|
||||
{
|
||||
"apiVersion": "v1",
|
||||
"kind": "Pod",
|
||||
"metadata": {"name":"kube-scheduler"},
|
||||
"metadata": {
|
||||
"name":"kube-scheduler",
|
||||
"namespace": "kube-system"
|
||||
},
|
||||
"spec":{
|
||||
"hostNetwork": true,
|
||||
"containers":[
|
||||
@ -15,8 +18,9 @@
|
||||
],
|
||||
"livenessProbe": {
|
||||
"httpGet": {
|
||||
"path": "/healthz",
|
||||
"port": 10251
|
||||
"host": "127.0.0.1",
|
||||
"port": 10251,
|
||||
"path": "/healthz"
|
||||
},
|
||||
"initialDelaySeconds": 15,
|
||||
"timeoutSeconds": 1
|
||||
|
Loading…
Reference in New Issue
Block a user