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