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diff --git a/heartbeat/docker b/heartbeat/docker
index 9f662c833..1b05f842b 100755
--- a/heartbeat/docker
+++ b/heartbeat/docker
@@ -1,291 +1,328 @@
#!/bin/sh
#
# The docker HA resource agent creates and launches a docker container
# based off a supplied docker image. Containers managed by this agent
# are both created and removed upon the agent's start and stop actions.
#
# Copyright (c) 2014 David Vossel <dvossel@redhat.com>
# All Rights Reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like. Any license provided herein, whether implied or
# otherwise, applies only to this software file. Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
#
#######################################################################
# Initialization:
: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs
#######################################################################
meta_data()
{
cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="docker" version="0.9">
<version>1.0</version>
<longdesc lang="en">
The docker HA resource agent creates and launches a docker container
based off a supplied docker image. Containers managed by this agent
are both created and removed upon the agent's start and stop actions.
</longdesc>
<shortdesc lang="en">Docker container resource agent.</shortdesc>
<parameters>
<parameter name="image" required="1" unique="0">
<longdesc lang="en">
The docker image to base this container off of.
</longdesc>
<shortdesc lang="en">docker image</shortdesc>
<content type="string"/>
</parameter>
<parameter name="container" required="0" unique="0">
<longdesc lang="en">
The name to give the created container. By default this will
be that resource's instance name prefixed with 'HA-'.
</longdesc>
<shortdesc lang="en">docker container name</shortdesc>
<content type="string"/>
</parameter>
<parameter name="allow_pull" unique="0">
<longdesc lang="en">
Allow the image to be pulled from the configured docker registry when
the image does not exist locally. NOTE, this can drastically increase
the time required to start the container if the image repository is
pulled over the network.
</longdesc>
<shortdesc lang="en">Allow pulling non-local images</shortdesc>
<content type="boolean"/>
</parameter>
<parameter name="run_opts" required="0" unique="0">
<longdesc lang="en">
Add options to be appended to the 'docker run' command which is used
when creating the container during the start action. This option allows
users to do things such as setting a custom entry point and injecting
environment variables into the newly created container. Note the '-d'
option is supplied regardless of this value to force containers to run
in the background.
</longdesc>
<shortdesc lang="en">run options</shortdesc>
<content type="string"/>
</parameter>
<parameter name="run_cmd" required="0" unique="0">
<longdesc lang="en">
Specifiy a command to launch within the container once
it has initialized.
</longdesc>
<shortdesc lang="en">run command</shortdesc>
<content type="string"/>
</parameter>
<parameter name="force_kill" required="0" unique="0">
<longdesc lang="en">
Kill a container immediately rather than waiting for it to gracefully
shutdown
</longdesc>
<shortdesc lang="en">force kill</shortdesc>
<content type="boolean"/>
</parameter>
+<parameter name="reuse" required="0" unique="0">
+<longdesc lang="en">
+Allow the container to be reused after stopping the container. By default
+containers are removed after stop. With the reuse option containers
+will persist after the container stops.
+</longdesc>
+<shortdesc lang="en">reuse container</shortdesc>
+<content type="boolean"/>
+</parameter>
+
</parameters>
<actions>
<action name="start" timeout="90" />
<action name="stop" timeout="90" />
<action name="monitor" timeout="30" interval="30" depth="0" />
<action name="meta-data" timeout="5" />
<action name="validate-all" timeout="30" />
</actions>
</resource-agent>
END
}
#######################################################################
REQUIRE_IMAGE_PULL=0
docker_usage()
{
cat <<END
usage: $0 {start|stop|monitor|validate-all|meta-data}
Expects to have a fully populated OCF RA-compliant environment set.
END
}
+container_exists()
+{
+ docker inspect $CONTAINER > /dev/null 2>&1
+}
+
+remove_container()
+{
+ if ocf_is_true "$OCF_RESKEY_reuse"; then
+ # never remove the container if we have reuse enabled.
+ return 0
+ fi
+
+ ocf_log notice "Cleaning up inactive container, ${CONTAINER}."
+ ocf_run docker rm $CONTAINER
+}
+
docker_monitor()
{
+ container_exists
+ if [ $? -ne 0 ]; then
+ return $OCF_NOT_RUNNING
+ fi
+
docker inspect $CONTAINER 2>&1 | grep '^ *\"Running.*:.*true' > /dev/null 2>&1
if [ $? -eq 0 ]; then
return $OCF_SUCCESS
fi
# check for left over containers that may be inactive but left over after a reboot.
docker inspect $CONTAINER 2>&1 | grep '^ *\"Running.*:.*false' > /dev/null 2>&1
if [ $? -eq 0 ]; then
- ocf_log notice "Cleaning up inactive container, ${CONTAINER}. Container exists but is not running."
- docker rm $CONTAINER > /dev/null 2>&1
+ remove_container
return $OCF_NOT_RUNNING
fi
return $OCF_NOT_RUNNING
}
docker_start()
{
local run_opts="-d --name=${CONTAINER}"
# check to see if the container has already started
docker_monitor
if [ $? -eq $OCF_SUCCESS ]; then
return $OCF_SUCCESS
fi
if [ -n "$OCF_RESKEY_run_opts" ]; then
run_opts="$run_opts $OCF_RESKEY_run_opts"
fi
if [ $REQUIRE_IMAGE_PULL -eq 1 ]; then
ocf_log notice "Beginning pull of image, ${OCF_RESKEY_image}"
docker pull "${OCF_RESKEY_image}"
if [ $? -ne 0 ]; then
ocf_exit_reason "failed to pull image ${OCF_RESKEY_image}"
return $OCF_ERR_GENERIC
fi
fi
- ocf_run docker run $run_opts $OCF_RESKEY_image $OCF_RESKEY_run_cmd
+ if ocf_is_true "$OCF_RESKEY_reuse" && container_exists; then
+ ocf_log info "starting existing container $CONTAINER."
+ ocf_run docker start $CONTAINER
+ else
+ ocf_log info "running container $CONTAINER for the first time"
+ ocf_run docker run $run_opts $OCF_RESKEY_image $OCF_RESKEY_run_cmd
+ fi
+
if [ $? -ne 0 ]; then
- ocf_exit_reason "docker run command failed to launch container"
+ ocf_exit_reason "docker failed to launch container"
return $OCF_ERR_GENERIC
fi
docker_monitor
if [ $? -ne $OCF_SUCCESS ]; then
ocf_exit_reason "Newly created docker container exited after start"
return $OCF_ERR_GENERIC
fi
return $OCF_SUCCESS
}
docker_stop()
{
local timeout=60
docker_monitor
if [ $? -eq $OCF_NOT_RUNNING ]; then
return $OCF_SUCCESS
fi
if [ -n "$OCF_RESKEY_CRM_meta_timeout" ]; then
timeout=$((($OCF_RESKEY_CRM_meta_timeout/1000) -10 ))
if [ $timeout -lt 10 ]; then
timeout=10
fi
fi
if ocf_is_true "$OCF_RESKEY_force_kill"; then
ocf_run docker kill $CONTAINER
else
ocf_log debug "waiting $timeout second[s] before killing container"
ocf_run docker stop -t=$timeout $CONTAINER
fi
if [ $? -ne 0 ]; then
ocf_exit_reason "Failed to stop container, ${CONTAINER}, based on image, ${OCF_RESKEY_image}."
return $OCF_ERR_GENERIC
fi
- ocf_run docker rm $CONTAINER
+ remove_container
if [ $? -ne 0 ]; then
ocf_exit_reason "Failed to remove stopped container, ${CONTAINER}, based on image, ${OCF_RESKEY_image}."
return $OCF_ERR_GENERIC
fi
return $OCF_SUCCESS
}
image_exists()
{
local res=1
echo "${OCF_RESKEY_image}" | grep -q ":"
if [ $? -eq 0 ]; then
docker images | awk '{print $1 ":" $2}' | grep "^${OCF_RESKEY_image}\$" > /dev/null 2>&1
else
docker images | awk '{print $1}' | grep "^${OCF_RESKEY_image}\$" > /dev/null 2>&1
fi
if [ $? -eq 0 ]; then
return 0
fi
if ocf_is_true "$OCF_RESKEY_allow_pull"; then
REQUIRE_IMAGE_PULL=1
ocf_log notice "Image (${OCF_RESKEY_image}) does not exist locally but will be pulled during start"
return 0
fi
# image not found.
return 1
}
docker_validate()
{
check_binary docker
if [ -z "$OCF_RESKEY_image" ]; then
ocf_exit_reason "'image' option is required"
exit $OCF_ERR_CONFIGURED
fi
image_exists
if [ $? -ne 0 ]; then
ocf_exit_reason "base image, ${OCF_RESKEY_image}, could not be found."
exit $OCF_ERR_CONFIGURED
fi
return $OCF_SUCCESS
}
: ${OCF_RESKEY_container=HA-${OCF_RESOURCE_INSTANCE}}
CONTAINER=$OCF_RESKEY_container
case $__OCF_ACTION in
meta-data) meta_data
exit $OCF_SUCCESS;;
start)
docker_validate
docker_start;;
stop) docker_stop;;
monitor) docker_monitor;;
validate-all) docker_validate;;
usage|help) docker_usage
exit $OCF_SUCCESS
;;
*) docker_usage
exit $OCF_ERR_UNIMPLEMENTED
;;
esac
rc=$?
ocf_log debug "${OCF_RESOURCE_INSTANCE} $__OCF_ACTION : $rc"
exit $rc

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