一，运行su nobody -c "/usr/local/squid/bin/RunCache &"时提示nobody 不是一个有效的帐户（英文提示忘记了）
解决：
vi /etc/passwd
将nobody的shell由/sbin/nologin 改为/bin/bash
二，提示
FATAL: Cannot open '/usr/local/squid/var/logs/access.log' for writing.
The parent directory must be writeable by the
user 'nobody', which is the cache_effective_user
set in squid.conf.
Squid Cache (Version 2.5.STABLE9): Terminated abnormally.
解决：
chown -R nobody.nobody /usr/local/squid/var
三，/etc/resolv.conf总是在电脑重启后被dhclient修改为192.168.1.1，导致客户端不能上网。
解决：
chattr +i /etc/resolv.conf
lsattr /etc/resolv.conf
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