[!Tip]
部署mycat中间件转载请注明出处：https://janrs.com/jozi
部署 Mycat 中间件
[!NOTE]
安装Mycat需要先安装jdk
版本就按照官方的来
1.安装 jdk1.8
[!NOTE]
jdk要求的版本可能随着mycat的升级而变化
此处用的是jdk1.8版本
去官网下载或者其他地方下载，解压到设置好到目录
cd /etc/java
tar -zxvf jdk-8u311-linux-x64.tar.gz修改环境变量
vi /etc/profile添加以下环境变量
export JAVA_HOME=/etc/java/jdk1.8.0_311/
export JRE_HOME=/etc/java/jdk1.8.0_311/jre
export CLASSPATH=.:$CLASSPATH:$JAVA_HOME/lib:$JRE_HOME/lib
export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin重载配置
source /etc/profile查看是否生效
有显示信息即可
java -version2.部署 Mycat
直接按照官网的教程即可顺利安装，只需要改一改 ip 地址以及连接 mysql 的账号密码啥的即可
地址： https://www.yuque.com/ccazhw/ml3nkf/ob0u6a
3.部署 xinetd 进程监听
[!NOTE]
xinetd部署在MyCat的服务器上用来监听MyCat的运行状态以上报给HAProxy
安装并设置开机自动启动
apt install xinetd net-tools -y && systemctl enable xinetd创建检测脚本
cat > /etc/xinetd.d/mycat-status <<EOF
service mycat-status
{
flags = REUSE
socket_type = stream
port = 48700
wait = no
user = root
server = /usr/local/bin/mycat-status
log_on_failure += USERID
disable = no
}
EOF创建可执行检测脚本
cat > /usr/local/bin/mycat-status <<'EOF'
#!/bin/bash
#/usr/local/bin/mycat-status
# This script checks if a Mycat server is healthy running on localhost.
# It will return:
# "HTTP/1.x 200 OK\r" (if Mycat is running smoothly)
# "HTTP/1.x 503 Internal Server Error\r" (else)
mycat=`/data/mycat/bin/mycat status | grep 'not running' | wc -l`
if [ "$mycat" = "0" ]; then
/bin/echo -e "HTTP/1.1 200 OK\r\n"
else
/bin/echo -e "HTTP/1.1 503 Service Unavailable\r\n"
fi
EOF
chmod a+x /usr/local/bin/mycat-status添加 mycat-status 服务
vim /etc/services在末尾添加
mycat-status 48700/tcp # mycat-status重启服务
systemctl restart xinetd查看状态
systemctl status xinetd如果有看到 mycat01 的服务表示有在监听，显示如下：
Feb 13 11:09:39 mycat01 xinetd[12075]: Reading included configuration file: /etc/xinetd.d/discard-udp [file=/etc/xinetd.d/discard-udp] [line=25]
Feb 13 11:09:39 mycat01 xinetd[12075]: Reading included configuration file: /etc/xinetd.d/echo [file=/etc/xinetd.d/echo] [line=14]
Feb 13 11:09:39 mycat01 xinetd[12075]: Reading included configuration file: /etc/xinetd.d/echo-udp [file=/etc/xinetd.d/echo-udp] [line=26]
Feb 13 11:09:39 mycat01 xinetd[12075]: Reading included configuration file: /etc/xinetd.d/mycat-status [file=/etc/xinetd.d/mycat-status] [line=14]
Feb 13 11:09:39 mycat01 xinetd[12075]: Reading included configuration file: /etc/xinetd.d/servers [file=/etc/xinetd.d/servers] [line=11]
Feb 13 11:09:39 mycat01 xinetd[12075]: Reading included configuration file: /etc/xinetd.d/services [file=/etc/xinetd.d/services] [line=13]
Feb 13 11:09:39 mycat01 xinetd[12075]: Reading included configuration file: /etc/xinetd.d/time [file=/etc/xinetd.d/time] [line=13]
Feb 13 11:09:39 mycat01 xinetd[12075]: Reading included configuration file: /etc/xinetd.d/time-udp [file=/etc/xinetd.d/time-udp] [line=28]
Feb 13 11:09:39 mycat01 xinetd[12075]: 2.3.15.3 started with libwrap loadavg labeled-networking options compiled in.
Feb 13 11:09:39 mycat01 xinetd[12075]: Started working: 1 available service查看 mycat-status 服务是否启动成功
netstat -antup|grep 48700显示如下：
tcp6 0 0 :::48700 :::* LISTEN 1210/xinetd
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