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demo: Add formatting and mounting to etcd image

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Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
This commit is contained in:
Rolf Neugebauer 2017-04-08 01:05:20 +01:00
parent a3d20abdb6
commit 31a4156686
2 changed files with 48 additions and 3 deletions
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4
projects/demo/etcd/Dockerfile
View File

@ -1,6 +1,10 @@
# A dockerfile to build an etcd container image from the upstream one
# with a script as entry point
FROM quay.io/coreos/etcd:v3.1.5
# sfdisk and jq re required to mount the disk
RUN apk add --no-cache sfdisk jq
COPY ./etcd.sh /
ENTRYPOINT ["/etcd.sh"]

47
projects/demo/etcd/etcd.sh
View File

@ -4,6 +4,39 @@
set -x
set -v
MOUNTPOINT=/var/etcd
mount_drive()
{
mkdir -p "$MOUNTPOINT"
# TODO fix for multiple disks, cdroms etc
DEVS="$(find /dev -maxdepth 1 -type b ! -name 'loop*' ! -name 'nbd*' | grep -v '[0-9]$' | sed 's@.*/dev/@@' | sort)"
for DEV in $DEVS
do
DRIVE="/dev/${DEV}"
# see if it has a partition table
if sfdisk -d "${DRIVE}" >/dev/null 2>/dev/null
then
# 83 is Linux partition identifier
DATA=$(sfdisk -J "$DRIVE" | jq -e -r '.partitiontable.partitions | map(select(.type=="83")) | .[0].node')
if [ $? -eq 0 ]
then
mount "$DATA" "$MOUNTPOINT" && return
fi
fi
done
echo "WARNING: Failed to mount a persistent volume (is there one?)"
# not sure if we want to fatally bail here, in some debug situations it is ok
# exit 1
}
mount_drive
# Wait till we have an IP address
IP=""
while [ -z "$IP" ]; do
@ -17,13 +50,20 @@ PREFIX=$(echo ${IP} | cut -d . -f 1,2,3)
NAME=infra${NUM}
# This should come from Metadata
INIT_CLUSTER=infra200=http://${PREFIX}.200:2380,infra201=http://${PREFIX}.201:2380,infra202=http://${PREFIX}.202:2380,infra203=http://${PREFIX}.203:2380,infra204=http://${PREFIX}.204:2380
INIT_CLUSTER="infra200=http://${PREFIX}.200:2380,infra201=http://${PREFIX}.201:2380,infra202=http://${PREFIX}.202:2380,infra203=http://${PREFIX}.203:2380,infra204=http://${PREFIX}.204:2380"
# Try to start in *new* cluster mode
# We currently have no easy way to determine if we join a cluster for
# the first time or if we got restarted and need to join an existing
# cluster. So we first try joining a *new* cluster. This fails if we
# had already joined it previously. As a fallback we then try to join
# an existing cluster.
# Try to join an new cluster
/usr/local/bin/etcd \
--name ${NAME} \
--debug \
--log-package-levels etcdmain=DEBUG,etcdserver=DEBUG \
--data-dir $MOUNTPOINT \
--initial-advertise-peer-urls http://${IP}:2380 \
--listen-peer-urls http://${IP}:2380 \
--listen-client-urls http://${IP}:2379,http://127.0.0.1:2379 \
@ -34,11 +74,12 @@ INIT_CLUSTER=infra200=http://${PREFIX}.200:2380,infra201=http://${PREFIX}.201:23
[ $? -eq 0 ] && exit 0
# Joining the new cluster failed. Let's try joining an *existing* cluster
# Try to join an existing cluster
/usr/local/bin/etcd \
--name ${NAME} \
--debug \
--log-package-levels etcdmain=DEBUG,etcdserver=DEBUG \
--data-dir $MOUNTPOINT \
--initial-advertise-peer-urls http://${IP}:2380 \
--listen-peer-urls http://${IP}:2380 \
--listen-client-urls http://${IP}:2379,http://127.0.0.1:2379 \