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Nginx ???????????

??

???????Nginx ????????????????????????????????Nginx ????????????????????????????????Nginx ??????????????????

??

A=$(ps -C nginx --no-header | wc -l)
if [ $A -eq 0 ]; then
    /usr/local/nginx/sbin/nginx
    sleep 2
    if [ `ps -C nginx --no-header | wc -l` -eq 0 ]; then
        killall keepalived
    fi
fi

????

1. ps -C nginx --no-header

ps -C nginx --no-header ?????????????Nginx ?????????-C ?????????????nginx ????????--no-header ??????????????????

?????

[root@bogon ~]# ps -C nginx --no-header
4983 ?        00:00:00 nginx
4984 ?        00:00:00 nginx

?????

• 4983 ? 4984 ???Nginx ?????????? PID?
• ? ???????00:00:00 ??????
• nginx ??????

?????

• ps -C nginx ? ps -ef | grep nginx ???-C ??????????????????
• ?? ps -C ??????? grep ?????????

2. wc -l

wc -l ??????????? ps ???ps -C nginx --no-header | wc -l ?????Nginx ??????

???

[root@bogon ~]# ps -C nginx --no-header | wc -l
2

???????? 0???Nginx ???????????? 0???????????

????

1. ??????

• ??Nginx ??????????? ps -C nginx --no-header | wc -l ??Nginx ?????
• ?????????????? 0??????????? /usr/local/nginx/sbin/nginx ?????
• ?????????????????????????????? 0??????????????? killall keepalived ???Nginx??????? keepalived??

2. ????

???????????????????????????

• Apache ???? nginx ??? apache?
• MySQL ???? nginx ??? mysql?
• ?????????????????????

??

???????????????Nginx ????????????Nginx????????????????????????

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