解决方案

/var/spool/squid/ 的权限不正确。

# ls -ld /var/spool/squid
drwxr-xr-x 2 root root 6 Apr 26 20:29 /var/spool/squid

1. 使用以下命令将目录的所有权从root修改为squid：

# chown squid:squid /var/spool/squid

2. 使用以下命令验证目录的权限：

# ls -ld /var/spool/squid
drwxr-xr-x 2 squid squid 6 Apr 26 20:29 /var/spool/squid

3. 使用以下命令启动Squid服务：

# systemctl start squid

4. 使用以下命令验证 squid 服务的状态：

# systemctl status squid

问题

Squid服务处于失败状态，错误如下：

# systemctl status squid.service

Jan 01 16:34:19 [hostname] systemd[1]: Starting Squid caching proxy...
Jan 01 16:34:19 [hostname] squid[2027]: Failed to make swap directory /var/spool/squid/00: (13) Permission denied  
squid[2027]：无法创建交换目录/var/spool/squid/00:（13）权限被拒绝

Jan 01 16:34:19 [hostname] cache_swap.sh[2022]: init_cache_dir /var/spool/squid...
Jan 01 16:34:19 [hostname] systemd[1]: squid.service: control process exited, code=exited status=1
Jan 01 16:34:19 [hostname] systemd[1]: Failed to start Squid caching proxy.
Jan 01 16:34:19 [hostname] systemd[1]: Unit squid.service entered failed state.
Jan 01 16:34:19 [hostname] systemd[1]: squid.service failed.