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https://github.com/k8snetworkplumbingwg/multus-cni.git
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[entrypoint] Adds --cleanup-config-on-exit to the entrypoint
This commit is contained in:
dougbtv
Tomofumi Hayashi
parent
7763f1593b
commit
b38ab9771c
@ -533,3 +533,7 @@ Used only with `--multus-conf-file=auto`. See the documentation for logging for
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Used only with `--multus-conf-file=auto`. Allows you to specify CNI spec version. Please set if you need to speicfy CNI spec version.
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--cni-version=
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In some cases, the original CNI configuration that the Multus configuration was generated from (using `--multus-conf-file=auto`) may be used as a sort of semaphor for network readiness -- as this model is used by the Kubelet itself. If you need to disable Multus' availablity, you may wish to clean out the generated configuration file when the source file for autogeneration of the config file is no longer present. You can use this functionality by setting:
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--cleanup-config-on-exit=true
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@ -3,6 +3,20 @@
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# Always exit on errors.
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set -e
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# Run a clean up when we exit if configured to do so.
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trap cleanup TERM
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function cleanup {
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if [ "$MULTUS_CLEANUP_CONFIG_ON_EXIT" == "true" ]; then
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CONF=$(cat <<-EOF
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{Multus configuration intentionally invalidated to prevent pods from being scheduled.}
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EOF
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)
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echo $CONF > $CNI_CONF_DIR/00-multus.conf
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log "Multus configuration intentionally invalidated to prevent pods from being scheduled."
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fi
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}
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# Set our known directories.
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CNI_CONF_DIR="/host/etc/cni/net.d"
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CNI_BIN_DIR="/host/opt/cni/bin"
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@ -14,6 +28,7 @@ MULTUS_NAMESPACE_ISOLATION=false
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MULTUS_LOG_LEVEL=""
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MULTUS_LOG_FILE=""
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OVERRIDE_NETWORK_NAME=false
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MULTUS_CLEANUP_CONFIG_ON_EXIT=false
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# Give help text for parameters.
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function usage()
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@ -38,6 +53,7 @@ function usage()
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echo -e "\t--multus-log-level=$MULTUS_LOG_LEVEL (empty by default, used only with --multus-conf-file=auto)"
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echo -e "\t--multus-log-file=$MULTUS_LOG_FILE (empty by default, used only with --multus-conf-file=auto)"
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echo -e "\t--override-network-name=false (used only with --multus-conf-file=auto)"
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echo -e "\t--cleanup-config-on-exit=false (used only with --multus-conf-file=auto)"
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}
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function log()
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@ -97,6 +113,9 @@ while [ "$1" != "" ]; do
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--override-network-name)
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OVERRIDE_NETWORK_NAME=$VALUE
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;;
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--cleanup-config-on-exit)
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MULTUS_CLEANUP_CONFIG_ON_EXIT=$VALUE
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;;
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*)
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warn "unknown parameter \"$PARAM\""
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;;
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@ -192,8 +211,9 @@ fi
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# ------------------------------- Generate "00-multus.conf"
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function generateMultusConf {
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if [ "$MULTUS_CONF_FILE" == "auto" ]; then
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log "Generating Multus configuration file ..."
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log "Generating Multus configuration file using files in $MULTUS_AUTOCONF_DIR..."
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found_master=false
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tries=0
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while [ $found_master == false ]; do
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@ -204,6 +224,13 @@ if [ "$MULTUS_CONF_FILE" == "auto" ]; then
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log "Attemping to find master plugin configuration, attempt $tries"
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fi
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let "tries+=1"
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# See if the Multus configuration file exists, if it does then clean it up.
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if [ "$MULTUS_CLEANUP_CONFIG_ON_EXIT" == true ] && [ -f "$CNI_CONF_DIR/00-multus.conf" ]; then
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# But first, check if it has the invalidated configuration in it (otherwise we keep doing this over and over.)
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if ! grep -q "invalidated" $CNI_CONF_DIR/00-multus.conf; then
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cleanup
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fi
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fi
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sleep 1;
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else
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error "Multus could not be configured: no master plugin was found."
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@ -254,34 +281,49 @@ if [ "$MULTUS_CONF_FILE" == "auto" ]; then
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MASTER_PLUGIN_NET_NAME="multus-cni-network"
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fi
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MASTER_PLUGIN_JSON="$(cat $MULTUS_AUTOCONF_DIR/$MASTER_PLUGIN)"
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MASTER_PLUGIN_LOCATION=$MULTUS_AUTOCONF_DIR/$MASTER_PLUGIN
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MASTER_PLUGIN_JSON="$(cat $MASTER_PLUGIN_LOCATION)"
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log "Using $MASTER_PLUGIN_LOCATION as a source to generate the Multus configuration"
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CONF=$(cat <<-EOF
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{
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{
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$CNI_VERSION_STRING
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"name": "$MASTER_PLUGIN_NET_NAME",
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"type": "multus",
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"name": "$MASTER_PLUGIN_NET_NAME",
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"type": "multus",
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$ISOLATION_STRING
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$LOG_LEVEL_STRING
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$LOG_FILE_STRING
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"kubeconfig": "$MULTUS_KUBECONFIG_FILE_HOST",
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"delegates": [
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$MASTER_PLUGIN_JSON
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]
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}
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"kubeconfig": "$MULTUS_KUBECONFIG_FILE_HOST",
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"delegates": [
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$MASTER_PLUGIN_JSON
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]
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}
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EOF
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)
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)
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echo $CONF > $CNI_CONF_DIR/00-multus.conf
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log "Config file created @ $CNI_CONF_DIR/00-multus.conf"
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echo $CONF
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mv ${MULTUS_AUTOCONF_DIR}/${MASTER_PLUGIN} ${MULTUS_AUTOCONF_DIR}/${MASTER_PLUGIN}.old
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log "Original master file moved to ${MULTUS_AUTOCONF_DIR}/${MASTER_PLUGIN}.old"
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fi
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done
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fi
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}
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generateMultusConf
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# ---------------------- end Generate "00-multus.conf".
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log "Entering sleep... (success)"
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# Sleep forever.
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sleep infinity
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# Enter either sleep loop, or watch loop...
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if [ "$MULTUS_CLEANUP_CONFIG_ON_EXIT" == true ]; then
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log "Entering watch loop..."
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while true; do
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# Check and see if the original master plugin configuration exists...
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if [ ! -f "$MASTER_PLUGIN_LOCATION" ]; then
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log "Master plugin @ $MASTER_PLUGIN_LOCATION has been deleted. Performing cleanup..."
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cleanup
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generateMultusConf
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log "Continuing watch loop after configuration regeneration..."
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fi
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sleep 1
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done
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else
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log "Entering sleep (success)..."
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sleep infinity
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fi
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