openstack/devstack
Code Issues Proposed changes

Add option to place etcd data dir on RAM disk

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Seems like for etcd-heavy services like Kubernetes, the fsync
performance of gate VM's are too low [1]. This commit implements an
option to put etcd data directory on RAM disk (tmpfs) to work this
around.

[1] http://lists.openstack.org/pipermail/openstack-discuss/2019-January/001849.html

Change-Id: I5a17099cb9d6941b1a009dc82daefd2c7946d892
This commit is contained in:
Michał Dulko 2018-12-21 13:17:05 +01:00
parent 7adc401bba
commit 6757a9c5de
1 changed files with 10 additions and 0 deletions
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10
lib/etcd3
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@ -27,6 +27,10 @@ set +o xtrace
ETCD_DATA_DIR="$DATA_DIR/etcd" ETCD_DATA_DIR="$DATA_DIR/etcd"
ETCD_SYSTEMD_SERVICE="devstack@etcd.service" ETCD_SYSTEMD_SERVICE="devstack@etcd.service"
ETCD_BIN_DIR="$DEST/bin" ETCD_BIN_DIR="$DEST/bin"
# Option below will mount ETCD_DATA_DIR as ramdisk, which is useful to run
# etcd-heavy services in the gate VM's, e.g. Kubernetes.
ETCD_USE_RAMDISK=$(trueorfalse False ETCD_USE_RAMDISK)
ETCD_RAMDISK_MB=${ETCD_RAMDISK_MB:-512}
if is_ubuntu ; then if is_ubuntu ; then
UBUNTU_RELEASE_BASE_NUM=`lsb_release -r | awk '{print $2}' | cut -d '.' -f 1` UBUNTU_RELEASE_BASE_NUM=`lsb_release -r | awk '{print $2}' | cut -d '.' -f 1`
@ -89,6 +93,9 @@ function cleanup_etcd3 {
$SYSTEMCTL daemon-reload $SYSTEMCTL daemon-reload
if [[ "$ETCD_USE_RAMDISK" == "True" ]]; then
sudo umount $ETCD_DATA_DIR
fi
sudo rm -rf $ETCD_DATA_DIR sudo rm -rf $ETCD_DATA_DIR
} }
@ -98,6 +105,9 @@ function install_etcd3 {
# Create the necessary directories # Create the necessary directories
sudo mkdir -p $ETCD_BIN_DIR sudo mkdir -p $ETCD_BIN_DIR
sudo mkdir -p $ETCD_DATA_DIR sudo mkdir -p $ETCD_DATA_DIR
if [[ "$ETCD_USE_RAMDISK" == "True" ]]; then
sudo mount -t tmpfs -o nodev,nosuid,size=${ETCD_RAMDISK_MB}M tmpfs $ETCD_DATA_DIR
fi
# Download and cache the etcd tgz for subsequent use # Download and cache the etcd tgz for subsequent use
local etcd_file local etcd_file