Keepalived+HAProxy 高可用负载均衡(3)

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Keepalived+HAProxy 高可用负载均衡

[日期：2013-09-20] 来源：Linux社区作者：davehe [字体：]

2.安装xinetd

root@10.1.6.203:~# apt-get install xinetd

3.在每个节点添加xinetd服务脚本和MySQLchk端口号

root@10.1.6.203:~# vim /etc/xinetd.d/mysqlchk
# default: on
# description: mysqlchk
service mysqlchk #需要在servive定义
{
flags = REUSE
socket_type = stream
port = 9222
wait = no
user = nobody
server = /opt/mysqlchk
log_on_failure += USERID
disable = no
per_source = UNLIMITED
bind = 10.1.6.173
}

root@10.1.6.203:~# vim /etc/services
mysqlchk 9222/tcp # mysqlchk

4.编写mysqlchk监控服务脚本

root@10.1.6.203:~# ls -l /opt/mysqlchk
-rwxr--r-- 1 nobody root 1994 2013-09-17 11:27 /opt/mysqlchk
root@10.1.6.203:~# cat /opt/mysqlchk
#!/bin/bash
#
# This script checks if a mysql server is healthy running on localhost. It will
# return:
# "HTTP/1.x 200 OK\r" (if mysql is running smoothly)
# - OR -
# "HTTP/1.x 500 Internal Server Error\r" (else)
#
# The purpose of this script is make haproxy capable of monitoring mysql properly
#

MYSQL_HOST="localhost"
MYSQL_SOCKET="/var/run/mysqld/mysqld.sock"
MYSQL_USERNAME="mysqlchkusr"
MYSQL_PASSWORD="secret"
MYSQL_OPTS="-N -q -A"
TMP_FILE="/dev/shm/mysqlchk.$$.out"
ERR_FILE="/dev/shm/mysqlchk.$$.err"
FORCE_FAIL="/dev/shm/proxyoff"
MYSQL_BIN="/opt/mysqlcluster/mysql-cluster-gpl-7.2.6-linux2.6-x86_64/bin/mysql"
CHECK_QUERY="select 1"

preflight_check()
{
for I in "$TMP_FILE" "$ERR_FILE"; do
if [ -f "$I" ]; then
if [ ! -w $I ]; then
echo -e "HTTP/1.1 503 Service Unavailable\r\n"
echo -e "Content-Type: Content-Type: text/plain\r\n"
echo -e "\r\n"
echo -e "Cannot write to $I\r\n"
echo -e "\r\n"
exit 1
fi
fi
done
}

return_ok()
{
echo -e "HTTP/1.1 200 OK\r\n"
echo -e "Content-Type: text/html\r\n"
echo -e "Content-Length: 43\r\n"
echo -e "\r\n"
echo -e "<html><body>MySQL is running.</body></html>\r\n"
echo -e "\r\n"
rm $ERR_FILE $TMP_FILE
exit 0
}
return_fail()
{
echo -e "HTTP/1.1 503 Service Unavailable\r\n"
echo -e "Content-Type: text/html\r\n"
echo -e "Content-Length: 42\r\n"
echo -e "\r\n"
echo -e "<html><body>MySQL is *down*.</body></html>\r\n"
sed -e 's/\n$/\r\n/' $ERR_FILE
echo -e "\r\n"
rm $ERR_FILE $TMP_FILE
exit 1
}
preflight_check
if [ -f "$FORCE_FAIL" ]; then
echo "$FORCE_FAIL found" > $ERR_FILE
return_fail;
fi
$MYSQL_BIN $MYSQL_OPTS --host=$MYSQL_HOST --socket=$MYSQL_SOCKET --user=$MYSQL_USERNAME --password=$MYSQL_PASSWORD -e "$CHECK_QUERY" > $TMP_FILE 2> $ERR_FILE
if [ $? -ne 0 ]; then
return_fail;
fi
return_ok;

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Keepalived+HAProxy 高可用负载均衡(3)

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