Keepalived container

This patch contains keepalived container for yum-based distros.

Change-Id: I8e3ea7a61ad6c27b25b635e7aeeff5ef04a807b4
Implements: blueprint keepalived-container

compose/keepalived.yml

@@ -0,0 +1,8 @@
+keepalived:
+  image: kollaglue/centos-rdo-keepalived:latest
+  name: keepalived
+  restart: always
+  net: "host"
+  privileged: true
+  env_file:
+   - openstack.env

docker/centos/binary/keepalived/Dockerfile

@@ -0,0 +1,13 @@
+FROM %%KOLLA_NAMESPACE%%/%%KOLLA_PREFIX%%base:%%KOLLA_TAG%%
+MAINTAINER Kolla Project (https://launchpad.net/kolla)
+
+RUN yum -y install \
+        hostname \
+        keepalived \
+        socat \
+    && yum clean all
+
+COPY keepalived.conf /etc/keepalived/
+
+COPY start.sh check_alive.sh /
+CMD ["/start.sh"]

docker/centos/binary/keepalived/build

@@ -0,0 +1 @@
+../../../../tools/build-docker-image

docker/centos/binary/keepalived/check_alive.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+# This is noop check script. Change it to something meaningful.
+# TODO (inc0): When HAProxy is implemented, this should be changed to HAProxy check
+# https://github.com/stackforge/kolla/blob/master/specs/high-availability.rst
+
+exit 0

docker/centos/binary/keepalived/keepalived.conf

@@ -0,0 +1,19 @@
+vrrp_script check_alive {
+    script "/check_alive.sh"
+    interval 2
+    weight -10
+}
+
+vrrp_instance Floating {
+    state MASTER
+    interface @PUBLIC_INTERFACE@
+    virtual_router_id 51
+    priority @KEEPALIVED_PRIORITY@
+    advert_int 1
+    virtual_ipaddress {
+        @PUBLIC_IP@
+    }
+    track_script {
+        check_alive
+    }
+}

docker/centos/binary/keepalived/start.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+. /opt/kolla/kolla-common.sh
+
+check_required_vars KEEPALIVED_HOST_PRIORITIES PUBLIC_IP PUBLIC_INTERFACE
+
+MY_HOSTNAME=`hostname`
+
+# here we unpack KEEPALIVED_HOST_PRIORITIES hostname:priority pairs and match
+# them with current hostname, if it's there
+for i in ${KEEPALIVED_HOST_PRIORITIES//,/ }; do
+    HOST_PRIORITY=(${i//:/ })
+    if [ "$MY_HOSTNAME" == "${HOST_PRIORITY[0]}" ]; then
+        KEEPALIVED_PRIORITY=${HOST_PRIORITY[1]}
+    fi
+done
+
+if [ -z "$KEEPALIVED_PRIORITY" ]; then
+    echo "ERROR: missing hostname in KEEPALIVED_HOST_PRIORITIES: $MY_HOSTNAME" >&2
+    exit 1
+fi
+
+sed -i '
+    s|@PUBLIC_INTERFACE@|'$PUBLIC_INTERFACE'|g
+    s|@PUBLIC_IP@|'$PUBLIC_IP'|g
+    s|@KEEPALIVED_PRIORITY@|'$KEEPALIVED_PRIORITY'|g
+' /etc/keepalived/keepalived.conf
+
+exec /usr/sbin/keepalived -nld -p /run/keepalived.pid

docs/integration-guide.md

@@ -167,6 +167,8 @@ all containers.  This allows a simple method of ensuring every type of node
     CINDER_VOLUME_BACKEND_NAME=<LVM_iSCSI57> - The backend name for a given driver implementation
     CINDER_VOLUME_DRIVER=<cinder.volume.drivers.lvm.LVMISCSIDriver> - The driver used for volume creation
     CINDER_ENABLED_BACKEND=<lvm57> - A list of backend names to use
+    INIT_CINDER_DB=<true|false> - Initialize or update the cinder db
+    KEEPALIVED_HOST_PRIORITIES=<host1:100,host2:99> - Map of priorities per node. Priorities have to be unique.
 
 [Minimum environment variable setup guide.](https://github.com/stackforge/kolla/blob/master/docs/minimal-environment-vars.md)
 

tools/genenv

@@ -197,6 +197,10 @@ CINDER_VOLUME_BACKEND_NAME=LVM_iSCSI57
 CINDER_VOLUME_DRIVER=cinder.volume.drivers.lvm.LVMISCSIDriver
 CINDER_ENABLED_BACKEND=lvm57
 
+# Keepalived
+# Here we define pairs hostname:priority. Priorities have to be unique
+KEEPALIVED_HOST_PRIORITIES=host1:100,host2:99
+
 cat > ./openrc <<EOF
 export OS_AUTH_URL="http://${KEYSTONE_PUBLIC_SERVICE_HOST}:5000/v2.0"
 export OS_USERNAME=$ADMIN_TENANT_NAME
@@ -345,6 +349,8 @@ INIT_GLANCE_DB=$INIT_GLANCE_DB
 INIT_HEAT_DB=$INIT_HEAT_DB
 INIT_KEYSTONE_DB=$INIT_KEYSTONE_DB
 INIT_NOVA_DB=$INIT_NOVA_DB
+KEEPALIVED_HOST_PRIORITIES=$KEEPALIVED_HOST_PRIORITIES
+
 EOF
 echo Please customize your FLAT_INTERFACE to a different network then your
 echo main network. The FLAT_INTERFACE is used for inter-VM communication.