技术学堂
RabbitMQ集群配置
不建议用Haproxy负载RabbitMQ，而是采用Openstack自带的RabbitMQ集群管理模式。
通过Haproxy负载RabbitMQ时，nova-api会报如下错误：
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Unexpected error during heartbeart thread processing, retrying...: IOError: Socket closed |
虽然暂不清楚有什么影响（系统和虚拟机均正常运行），但既然有错误，就必须解决，修改配置/etc/nova/nova.conf：
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#transport_url=rabbit://openstack:Openstack123@10.10.100.98:5672 transport_url=rabbit://openstack:Openstack123@controller1:5672,controller2:5672,controller3:5672 |
或者调整Haproxy中的RabbitMQ配置，只保留一个master，其他的设为backup，设置方法请看后文。
MariaDB集群监控
创建数据库用户：
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mysql -uroot -pMariadb123 |
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GRANT PROCESS ON *.* TO 'clusterchecker'@'localhost' IDENTIFIED BY 'Clusterchecker123'; flush privileges; |
编辑MariaDB守护进程脚本/opt/scripts/mariadbchk：
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#!/bin/bash # # Script to make a proxy (ie HAProxy) capable of monitoring Percona XtraDB Cluster nodes properly # # Author: Olaf van Zandwijk <olaf.vanzandwijk@nedap.com> # Author: Raghavendra Prabhu <raghavendra.prabhu@percona.com> # # Documentation and download: https://github.com/olafz/percona-clustercheck # # Based on the original script from Unai Rodriguez # if [[ $1 == '-h' || $1 == '--help' ]];then echo "Usage: $0 <user> <pass> <available_when_donor=0|1> <log_file> <available_when_readonly=0|1> <defaults_extra_file>" exit fi # if the disabled file is present, return 503. This allows # admins to manually remove a node from a cluster easily. if [ -e "/var/tmp/clustercheck.disabled" ]; then # Shell return-code is 1 echo -en "HTTP/1.1 503 Service Unavailable\r\n" echo -en "Content-Type: text/plain\r\n" echo -en "Connection: close\r\n" echo -en "Content-Length: 51\r\n" echo -en "\r\n" echo -en "Percona XtraDB Cluster Node is manually disabled.\r\n" sleep 0.1 exit 1 fi set -e if [ -f /etc/sysconfig/clustercheck ]; then . /etc/sysconfig/clustercheck fi MYSQL_USERNAME="${MYSQL_USERNAME:-clusterchecker}" #数据库用户名，请注意格式 MYSQL_PASSWORD="${MYSQL_PASSWORD:-nM2JC8Wi1x0L}" #数据库密码，请注意格式 AVAILABLE_WHEN_DONOR=${AVAILABLE_WHEN_DONOR:-0} ERR_FILE="${ERR_FILE:-/dev/null}" AVAILABLE_WHEN_READONLY=${AVAILABLE_WHEN_READONLY:-1} DEFAULTS_EXTRA_FILE=${DEFAULTS_EXTRA_FILE:-/etc/my.cnf} #Timeout exists for instances where mysqld may be hung TIMEOUT=10 EXTRA_ARGS="" if [[ -n "$MYSQL_USERNAME" ]]; then EXTRA_ARGS="$EXTRA_ARGS --user=${MYSQL_USERNAME}" fi if [[ -n "$MYSQL_PASSWORD" ]]; then EXTRA_ARGS="$EXTRA_ARGS --password=${MYSQL_PASSWORD}" fi if [[ -r $DEFAULTS_EXTRA_FILE ]];then MYSQL_CMDLINE="mysql --defaults-extra-file=$DEFAULTS_EXTRA_FILE -nNE --connect-timeout=$TIMEOUT \ ${EXTRA_ARGS}" else MYSQL_CMDLINE="mysql -nNE --connect-timeout=$TIMEOUT ${EXTRA_ARGS}" fi # # Perform the query to check the wsrep_local_state # WSREP_STATUS=$($MYSQL_CMDLINE -e "SHOW STATUS LIKE 'wsrep_local_state';" \ 2>${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 # Percona XtraDB 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: 43\r\n" echo -en "\r\n" echo -en "Percona XtraDB Cluster Node is read-only.\r\n" sleep 0.1 exit 1 fi fi # Percona XtraDB 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: 40\r\n" echo -en "\r\n" echo -en "Percona XtraDB Cluster Node is synced.\r\n" sleep 0.1 exit 0 else # Percona XtraDB 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: 44\r\n" echo -en "\r\n" echo -en "Percona XtraDB Cluster Node is not synced.\r\n" sleep 0.1 exit 1 fi |
创建监控服务：
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# 安装xinetd yum -y install xinetd |
编辑配置/etc/xinetd.d/mariadbchk：
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service mariadbchk { disable = no flags = REUSE socket_type = stream port = 9200 wait = no user = nobody server = /opt/scripts/mariadbchk log_on_failure += USERID only_from = 0.0.0.0/0 per_source = UNLIMITED } |
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# 添加系统服务 echo "mariadbchk 9200/tcp # mariadbchk" >> /etc/services # 启动xinetd systemctl enable xinetd; systemctl start xinetd |
原创文章禁止转载：技术学堂 » Openstack云平台搭建课程八·控制节点集群
