Initial managed-container HA resource agent baseline
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Lyncoln
Executable
+372
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#!/bin/bash
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#
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# OCF resource agent for Linux IPVS connection synchronization
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#
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# Promoted = IPVS sync master
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# Unpromoted = IPVS sync backup
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#
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OCF_SUCCESS=0
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OCF_ERR_GENERIC=1
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OCF_ERR_ARGS=2
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OCF_ERR_UNIMPLEMENTED=3
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OCF_ERR_PERM=4
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OCF_ERR_INSTALLED=5
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OCF_ERR_CONFIGURED=6
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OCF_NOT_RUNNING=7
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OCF_RUNNING_PROMOTED=8
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OCF_FAILED_PROMOTED=9
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IPVSADM="${IPVSADM:-/usr/sbin/ipvsadm}"
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IP="${IP:-/usr/sbin/ip}"
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# The IP is used only to discover the LAN interface.
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# Different nodes may have different interface names.
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OCF_RESKEY_probe_ip="${OCF_RESKEY_probe_ip:-192.168.1.1}"
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OCF_RESKEY_interface="${OCF_RESKEY_interface:-}"
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meta_data()
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{
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cat <<'XML'
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<?xml version="1.0"?>
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<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
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<resource-agent name="ipvs-sync" version="1.0">
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<version>1.0</version>
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<longdesc lang="en">
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Manages the Linux IPVS connection synchronization daemon as a
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Pacemaker promotable resource.
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Unpromoted instances run the IPVS backup synchronization daemon.
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The promoted instance runs the IPVS master synchronization daemon.
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</longdesc>
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<shortdesc lang="en">
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IPVS connection synchronization
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</shortdesc>
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<parameters>
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<parameter name="probe_ip" unique="0" required="0">
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<longdesc lang="en">
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An IPv4 address reachable through the interface that should
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carry IPVS synchronization traffic. Used only for automatic
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interface discovery.
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</longdesc>
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<shortdesc lang="en">Interface discovery IP</shortdesc>
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<content type="string" default="192.168.1.1"/>
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</parameter>
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<parameter name="interface" unique="0" required="0">
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<longdesc lang="en">
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Optional explicit synchronization interface. If omitted,
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the interface is discovered using the route to probe_ip.
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</longdesc>
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<shortdesc lang="en">Synchronization interface</shortdesc>
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<content type="string"/>
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</parameter>
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</parameters>
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<actions>
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<action name="start" timeout="20s"/>
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<action name="stop" timeout="20s"/>
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<action name="monitor" timeout="10s" interval="10s"/>
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<action name="promote" timeout="20s"/>
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<action name="demote" timeout="20s"/>
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<action name="validate-all" timeout="10s"/>
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<action name="meta-data" timeout="5s"/>
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</actions>
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</resource-agent>
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XML
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}
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get_iface()
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{
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if [ -n "$OCF_RESKEY_interface" ]; then
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printf '%s\n' "$OCF_RESKEY_interface"
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return 0
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fi
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"$IP" route get "$OCF_RESKEY_probe_ip" 2>/dev/null |
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awk '
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{
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for (i=1; i<=NF; i++) {
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if ($i == "dev" && (i+1) <= NF) {
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print $(i+1)
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exit
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}
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}
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}'
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}
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daemon_status()
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{
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"$IPVSADM" -L --daemon 2>/dev/null
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}
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set_promotion_score()
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{
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/usr/sbin/crm_attribute --promotion --update 100 >/dev/null 2>&1 || true
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}
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monitor_resource()
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{
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local output
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local have_master=0
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local have_backup=0
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output="$(daemon_status)"
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printf '%s\n' "$output" |
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grep -q '^master sync daemon' &&
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have_master=1
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printf '%s\n' "$output" |
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grep -q '^backup sync daemon' &&
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have_backup=1
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# Both roles simultaneously is an invalid state.
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if [ "$have_master" -eq 1 ] &&
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[ "$have_backup" -eq 1 ]; then
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return "$OCF_ERR_GENERIC"
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fi
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if [ "$have_master" -eq 1 ]; then
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set_promotion_score
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return "$OCF_RUNNING_PROMOTED"
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fi
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if [ "$have_backup" -eq 1 ]; then
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set_promotion_score
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return "$OCF_SUCCESS"
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fi
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return "$OCF_NOT_RUNNING"
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}
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stop_master()
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{
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"$IPVSADM" --stop-daemon master >/dev/null 2>&1 || true
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}
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stop_backup()
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{
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"$IPVSADM" --stop-daemon backup >/dev/null 2>&1 || true
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}
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start_master()
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{
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local iface
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iface="$(get_iface)"
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if [ -z "$iface" ]; then
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echo "ERROR: unable to determine synchronization interface" >&2
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return "$OCF_ERR_GENERIC"
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fi
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"$IPVSADM" \
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--start-daemon master \
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--mcast-interface "$iface"
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}
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start_backup()
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{
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local iface
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iface="$(get_iface)"
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if [ -z "$iface" ]; then
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echo "ERROR: unable to determine synchronization interface" >&2
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return "$OCF_ERR_GENERIC"
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fi
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"$IPVSADM" \
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--start-daemon backup \
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--mcast-interface "$iface"
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}
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start_resource()
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{
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monitor_resource
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rc=$?
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case "$rc" in
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"$OCF_SUCCESS")
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# Already running correctly as backup.
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return "$OCF_SUCCESS"
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;;
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"$OCF_RUNNING_PROMOTED")
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# A start operation must leave a promotable resource
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# in its unpromoted state.
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stop_master
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start_backup || return "$OCF_ERR_GENERIC"
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;;
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"$OCF_NOT_RUNNING")
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start_backup || return "$OCF_ERR_GENERIC"
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;;
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*)
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return "$OCF_ERR_GENERIC"
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;;
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esac
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monitor_resource
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[ $? -eq "$OCF_SUCCESS" ] &&
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return "$OCF_SUCCESS"
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return "$OCF_ERR_GENERIC"
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}
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stop_resource()
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{
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stop_master
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stop_backup
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monitor_resource
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rc=$?
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[ "$rc" -eq "$OCF_NOT_RUNNING" ] &&
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return "$OCF_SUCCESS"
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return "$OCF_ERR_GENERIC"
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}
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promote_resource()
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{
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monitor_resource
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rc=$?
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case "$rc" in
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"$OCF_RUNNING_PROMOTED")
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return "$OCF_SUCCESS"
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;;
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"$OCF_SUCCESS")
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stop_backup
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if ! start_master; then
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# Try to return to a safe unpromoted state.
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start_backup >/dev/null 2>&1 || true
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return "$OCF_ERR_GENERIC"
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fi
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;;
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*)
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echo "ERROR: cannot promote IPVS sync resource from state rc=$rc" >&2
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return "$OCF_ERR_GENERIC"
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;;
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esac
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monitor_resource
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[ $? -eq "$OCF_RUNNING_PROMOTED" ] &&
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return "$OCF_SUCCESS"
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return "$OCF_ERR_GENERIC"
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}
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demote_resource()
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{
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monitor_resource
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rc=$?
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case "$rc" in
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"$OCF_SUCCESS")
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return "$OCF_SUCCESS"
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;;
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"$OCF_RUNNING_PROMOTED")
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stop_master
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if ! start_backup; then
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return "$OCF_ERR_GENERIC"
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fi
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;;
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"$OCF_NOT_RUNNING")
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# Be defensive: demote should result in a running
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# unpromoted instance.
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start_backup || return "$OCF_ERR_GENERIC"
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;;
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*)
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return "$OCF_ERR_GENERIC"
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;;
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esac
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monitor_resource
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[ $? -eq "$OCF_SUCCESS" ] &&
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return "$OCF_SUCCESS"
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return "$OCF_ERR_GENERIC"
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}
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validate_all()
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{
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if [ ! -x "$IPVSADM" ]; then
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echo "ERROR: ipvsadm not found at $IPVSADM" >&2
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return "$OCF_ERR_INSTALLED"
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fi
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if [ ! -x "$IP" ]; then
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echo "ERROR: ip command not found at $IP" >&2
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return "$OCF_ERR_INSTALLED"
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fi
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iface="$(get_iface)"
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if [ -z "$iface" ]; then
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echo "ERROR: unable to determine synchronization interface" >&2
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return "$OCF_ERR_ARGS"
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fi
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if ! "$IP" link show dev "$iface" >/dev/null 2>&1; then
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echo "ERROR: interface '$iface' does not exist" >&2
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return "$OCF_ERR_ARGS"
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fi
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return "$OCF_SUCCESS"
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}
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case "$1" in
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meta-data)
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meta_data
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exit "$OCF_SUCCESS"
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;;
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validate-all)
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validate_all
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exit $?
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;;
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start)
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start_resource
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exit $?
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;;
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stop)
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stop_resource
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exit $?
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;;
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monitor|status)
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monitor_resource
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exit $?
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;;
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promote)
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promote_resource
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exit $?
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;;
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demote)
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demote_resource
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exit $?
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;;
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*)
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echo "Usage: $0 {start|stop|monitor|promote|demote|validate-all|meta-data}" >&2
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exit "$OCF_ERR_UNIMPLEMENTED"
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;;
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esac
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