90 lines
3.3 KiB
Bash
90 lines
3.3 KiB
Bash
|
#!/bin/bash
|
||
|
|
#
|
||
|
|
# Script to make a proxy (ie HAProxy) capable of monitoring Galera cluster nodes properly
|
||
|
|
#
|
||
|
|
# Author: Olaf van Zandwijk <olaf.vanzandwijk@nedap.com>
|
||
|
|
# Author: Raghavendra Prabhu <raghavendra.prabhu@percona.com>
|
||
|
|
# Author: Ryan O'Hara <rohara@redhat.com>
|
||
|
|
#
|
||
|
|
# Documentation and download: https://github.com/olafz/percona-clustercheck
|
||
|
|
#
|
||
|
|
# Based on the original script from Unai Rodriguez
|
||
|
|
#
|
||
|
|
|
||
|
|
if [ -f @INSTALL_SYSCONFDIR@/sysconfig/clustercheck ]; then
|
||
|
|
. @INSTALL_SYSCONFDIR@/sysconfig/clustercheck
|
||
|
|
fi
|
||
|
|
|
||
|
|
MYSQL_USERNAME="${MYSQL_USERNAME-clustercheckuser}"
|
||
|
|
MYSQL_PASSWORD="${MYSQL_PASSWORD-clustercheckpassword!}"
|
||
|
|
MYSQL_HOST="${MYSQL_HOST:-127.0.0.1}"
|
||
|
|
MYSQL_PORT="${MYSQL_PORT:-3306}"
|
||
|
|
ERR_FILE="${ERR_FILE:-/dev/null}"
|
||
|
|
AVAILABLE_WHEN_DONOR=${AVAILABLE_WHEN_DONOR:-0}
|
||
|
|
AVAILABLE_WHEN_READONLY=${AVAILABLE_WHEN_READONLY:-1}
|
||
|
|
DEFAULTS_EXTRA_FILE=${DEFAULTS_EXTRA_FILE:-@INSTALL_SYSCONFDIR@/my.cnf}
|
||
|
|
|
||
|
|
#Timeout exists for instances where mysqld may be hung
|
||
|
|
TIMEOUT=10
|
||
|
|
|
||
|
|
if [[ -r $DEFAULTS_EXTRA_FILE ]];then
|
||
|
|
MYSQL_CMDLINE="mysql --defaults-extra-file=$DEFAULTS_EXTRA_FILE -nNE \
|
||
|
|
--connect-timeout=$TIMEOUT \
|
||
|
|
--user=${MYSQL_USERNAME} --password=${MYSQL_PASSWORD} \
|
||
|
|
--host=${MYSQL_HOST} --port=${MYSQL_PORT}"
|
||
|
|
else
|
||
|
|
MYSQL_CMDLINE="mysql -nNE --connect-timeout=$TIMEOUT \
|
||
|
|
--user=${MYSQL_USERNAME} --password=${MYSQL_PASSWORD} \
|
||
|
|
--host=${MYSQL_HOST} --port=${MYSQL_PORT}"
|
||
|
|
fi
|
||
|
|
#
|
||
|
|
# Perform the query to check the wsrep_local_state
|
||
|
|
#
|
||
|
|
WSREP_STATUS=$($MYSQL_CMDLINE -e "SHOW STATUS LIKE 'wsrep_local_state';" \
|
||
|
|
2>${ERR_FILE} | tail -1 2>>${ERR_FILE})
|
||
|
|
|
||
|
|
if [[ "${WSREP_STATUS}" == "4" ]] || [[ "${WSREP_STATUS}" == "2" && ${AVAILABLE_WHEN_DONOR} == 1 ]]
|
||
|
|
then
|
||
|
|
# Check only when set to 0 to avoid latency in response.
|
||
|
|
if [[ $AVAILABLE_WHEN_READONLY -eq 0 ]];then
|
||
|
|
READ_ONLY=$($MYSQL_CMDLINE -e "SHOW GLOBAL VARIABLES LIKE 'read_only';" \
|
||
|
|
2>${ERR_FILE} | tail -1 2>>${ERR_FILE})
|
||
|
|
|
||
|
|
if [[ "${READ_ONLY}" == "ON" ]];then
|
||
|
|
# Galera cluster node local state is 'Synced', but it is in
|
||
|
|
# read-only mode. The variable AVAILABLE_WHEN_READONLY is set to 0.
|
||
|
|
# => return HTTP 503
|
||
|
|
# Shell return-code is 1
|
||
|
|
echo -en "HTTP/1.1 503 Service Unavailable\r\n"
|
||
|
|
echo -en "Content-Type: text/plain\r\n"
|
||
|
|
echo -en "Connection: close\r\n"
|
||
|
|
echo -en "Content-Length: 35\r\n"
|
||
|
|
echo -en "\r\n"
|
||
|
|
echo -en "Galera cluster node is read-only.\r\n"
|
||
|
|
sleep 0.1
|
||
|
|
exit 1
|
||
|
|
fi
|
||
|
|
fi
|
||
|
|
# Galera cluster node local state is 'Synced' => return HTTP 200
|
||
|
|
# Shell return-code is 0
|
||
|
|
echo -en "HTTP/1.1 200 OK\r\n"
|
||
|
|
echo -en "Content-Type: text/plain\r\n"
|
||
|
|
echo -en "Connection: close\r\n"
|
||
|
|
echo -en "Content-Length: 32\r\n"
|
||
|
|
echo -en "\r\n"
|
||
|
|
echo -en "Galera cluster node is synced.\r\n"
|
||
|
|
sleep 0.1
|
||
|
|
exit 0
|
||
|
|
else
|
||
|
|
# Galera cluster node local state is not 'Synced' => return HTTP 503
|
||
|
|
# Shell return-code is 1
|
||
|
|
echo -en "HTTP/1.1 503 Service Unavailable\r\n"
|
||
|
|
echo -en "Content-Type: text/plain\r\n"
|
||
|
|
echo -en "Connection: close\r\n"
|
||
|
|
echo -en "Content-Length: 36\r\n"
|
||
|
|
echo -en "\r\n"
|
||
|
|
echo -en "Galera cluster node is not synced.\r\n"
|
||
|
|
sleep 0.1
|
||
|
|
exit 1
|
||
|
|
fi
|