squid异常停止的排查步骤

1. 今天重启squid的时候发现，squid启动后，status 一会就stop了

whoami@blackman:~/script/AutoProxy-master/main/server$ sudo service squid3 start
squid3 start/running, process 19021
whoami@blackman:~/script/AutoProxy-master/main/server$ sudo service squid3 status
squid3 start/running, process 19154
whoami@blackman:~/script/AutoProxy-master/main/server$ sudo service squid3 status
squid3 stop/waiting

1. 通过查看日志文件发现是了异常，提示中建议运行squid -z来检查swap 目录

FATAL:  Failed to verify one of the swap directories, Check cache.log
        for details.  Run 'squid -z' to create swap directories
        if needed, or if running Squid for the first time.
Squid Cache (Version 3.3.8): Terminated abnormally.
CPU Usage: 0.016 seconds = 0.009 user + 0.007 sys
Maximum Resident Size: 73008 KB
Page faults with physical i/o: 0

1. 通过查看squid -z发现是因为权限的问题，导致缓存文件无法写入

whoami@blackman:~/script/AutoProxy-master/main/server$ /usr/sbin/squid3 -z
whoami@blackman:~/script/AutoProxy-master/main/server$ 2018/01/24 11:26:12 kid1| Creating missing swap directories
FATAL: Failed to make swap directory /var/cache/squid: (13) Permission denied
2018/01/24 11:26:15 kid1| Creating missing swap directories
FATAL: Failed to make swap directory /var/cache/squid: (13) Permission denied

1. 于是用sudo chmod 777 /var/cache/squid/就解决了，这里由于是局域网服务器，直接就是777，简单粗暴些。

whoami@blackman:~/script/AutoProxy-master/main/server$ sudo chmod 777 /var/cache/squid/
whoami@blackman:~/script/AutoProxy-master/main/server$ sudo /usr/sbin/squid3 -z
whoami@blackman:~/script/AutoProxy-master/main/server$ 2018/01/24 11:29:42 kid1| Creating missing swap directories
2018/01/24 11:29:42 kid1| /var/cache/squid exists
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/00
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/01
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/02
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/03
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/04
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/05
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/06
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/07
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/08
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/09
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/0A
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/0B
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/0C
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/0D
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/0E
2018/01/24 11:29:42 kid1| Making directories in /var/cache/squid/0F

到这里就解决了。squid -z创建完swap 目录后，会停在那，我等了几分钟，等不急了，直接ctrl+c给他结束了。然后service squid3 start就正常了。

DEUBG手册：

1. 出问题时先去翻日志文件，一般成熟的软件都有完善的日志记录，对定位异常非常有帮助 。