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Make gci mounter pre-fetch mounter image to reduce startup latency during runtime

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Signed-off-by: Vishnu kannan <vishnuk@google.com>
This commit is contained in:
Vishnu kannan 2016-11-04 17:09:40 -07:00
parent d07396f7c7
commit 773ad9be29
2 changed files with 26 additions and 2 deletions
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9
cluster/gce/gci/mounter/mounter
View File

@ -24,13 +24,14 @@ ROOT_DIR=/home/kubernetes/bin
RKT_BINARY=${ROOT_DIR}/rkt RKT_BINARY=${ROOT_DIR}/rkt
STAGE1_ACI=${ROOT_DIR}/stage1-fly.aci STAGE1_ACI=${ROOT_DIR}/stage1-fly.aci
MOUNTER_ACI=${ROOT_DIR}/gci-mounter-${MOUNTER_VERSION}.aci MOUNTER_ACI=${ROOT_DIR}/gci-mounter-${MOUNTER_VERSION}.aci
MOUNTER_IMAGE=gcr.io/google_containers/gci-mounter:${MOUNTER_VERSION}
function gc { function gc {
# Attempt to garbage collect rkt pods with 5 retries. # Attempt to garbage collect rkt pods with 5 retries.
# Rkt pods end up creating new copies of mounts on the host. Hence it is ideal to clean them up right away. # Rkt pods end up creating new copies of mounts on the host. Hence it is ideal to clean them up right away.
attempt=0 attempt=0
until [ $attempt -ge 5 ]; do until [ $attempt -ge 5 ]; do
${RKT_BINARY} gc --grace-period=0s && break ${RKT_BINARY} gc --grace-period=0s &> /dev/null && break
attempt=$[$attempt+1] attempt=$[$attempt+1]
sleep 1 sleep 1
done done
@ -39,12 +40,16 @@ function gc {
# Garbage collect old rkt containers on exit # Garbage collect old rkt containers on exit
trap gc EXIT trap gc EXIT
if [[ ! $(${RKT_BINARY} image list | grep ${MOUNTER_IMAGE}) ]]; then
${RKT_BINARY} fetch --insecure-options=image file://${MOUNTER_ACI}
fi
echo "Running mount using a rkt fly container" echo "Running mount using a rkt fly container"
${RKT_BINARY} run --stage1-path=${STAGE1_ACI} \ ${RKT_BINARY} run --stage1-path=${STAGE1_ACI} \
--insecure-options=image \ --insecure-options=image \
--volume=kubelet,kind=host,source=/var/lib/kubelet,readOnly=false,recursive=true \ --volume=kubelet,kind=host,source=/var/lib/kubelet,readOnly=false,recursive=true \
--mount volume=kubelet,target=/var/lib/kubelet \ --mount volume=kubelet,target=/var/lib/kubelet \
file://${MOUNTER_ACI} --user=${MOUNTER_USER} --exec /bin/mount -- "$@" ${MOUNTER_IMAGE} --user=${MOUNTER_USER} --exec /bin/mount -- "$@"
echo "Successfully ran mount using a rkt fly container" echo "Successfully ran mount using a rkt fly container"

19
cluster/gce/gci/mounter/stage-upload.sh
View File

@ -1,5 +1,24 @@
#!/bin/sh #!/bin/sh
# Copyright 2016 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Due to the GCE custom metadata size limit, we split the entire script into two
# files configure.sh and configure-helper.sh. The functionality of downloading
# kubernetes configuration, manifests, docker images, and binary files are
# put in configure.sh, which is uploaded via GCE custom metadata.
set -o errexit set -o errexit
set -o pipefail set -o pipefail
set -o nounset set -o nounset