systemctl restart httpd 启动失败 Apache HTTP 服务器 httpd pid 已经运行

Question

I recently rebuilt my server on AWS, upgrading from Amazon Linux to Amazon Linux 2, which like Linux 1 appears to be a fork of CentOS, now CentOS 7. My vhost config remains the same as the previous build while all the other conf files are较新的默认文件。 （仅供参考，不确定它是否有任何影响）。

由于重建我不能再做systemctl restart httpd 。 我收到错误The Apache HTTP Server httpd pid (NNNN) already running 。

我做了很多谷歌搜索，发现很多人都有这个错误，但结果总是与他们所做的不同。 我想不出我所做的任何“不同”。

我了解到，我看到的“已经在运行”的 PID 是 root 拥有的，是“主进程”，而 apache 拥有的所有其他 PID 是“工作进程”。 https://serverfault.com/questions/355223/centos-httpd-running-as-both-root-and-apache-user

root      4461     1  0 07:18 ?        00:00:00 /usr/sbin/httpd -k restart
apache    4467  4461  0 07:18 ?        00:00:09 /usr/sbin/httpd -k restart
apache    4468  4461  0 07:18 ?        00:00:08 /usr/sbin/httpd -k restart
apache    4471  4461  0 07:18 ?        00:00:08 /usr/sbin/httpd -k restart
apache    4477  4461  0 07:18 ?        00:00:08 /usr/sbin/httpd -k restart
apache    4498  4461  0 07:18 ?        00:00:07 /usr/sbin/httpd -k restart
apache    5236  4461  0 07:19 ?        00:00:08 /usr/sbin/httpd -k restart
apache    5248  4461  0 07:19 ?        00:00:09 /usr/sbin/httpd -k restart
apache    5987  4461  0 07:20 ?        00:00:09 /usr/sbin/httpd -k restart
apache    5993  4461  0 07:20 ?        00:00:08 /usr/sbin/httpd -k restart
apache    5994  4461  0 07:20 ?        00:00:09 /usr/sbin/httpd -k restart
# systemctl restart httpd;systemctl status httpd;
Job for httpd.service failed. See "systemctl status httpd.service" and "journalctl -xe" for details.
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
   Active: failed (Result: protocol) since Thu 2021-12-23 19:56:05 UTC; 4ms ago
     Docs: man:httpd.service(8)
  Process: 31799 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=0/SUCCESS)
 Main PID: 31799 (code=exited, status=0/SUCCESS)
   Status: "Reading configuration..."

Dec 23 19:56:04 ip-10-5-11-55.ec2.internal systemd[1]: Starting The Apache HTTP Server...
Dec 23 19:56:05 ip-10-5-11-55.ec2.internal httpd[31799]: httpd (pid 4461) already running
Dec 23 19:56:05 ip-10-5-11-55.ec2.internal systemd[1]: Failed to start The Apache HTTP Server.
Dec 23 19:56:05 ip-10-5-11-55.ec2.internal systemd[1]: Unit httpd.service entered failed state.
Dec 23 19:56:05 ip-10-5-11-55.ec2.internal systemd[1]: httpd.service failed.

Apache 错误日志中没有异常：

[Thu Dec 23 07:18:58.777745 2021] [suexec:notice] [pid 4460] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Thu Dec 23 07:18:58.802753 2021] [lbmethod_heartbeat:notice] [pid 4461] AH02282: No slotmem from mod_heartmonitor
[Thu Dec 23 07:18:58.802850 2021] [http2:warn] [pid 4461] AH10034: The mpm module (prefork.c) is not supported by mod_http2. The mpm determines how things are processed in your server. HTTP/2 has more
[Thu Dec 23 07:18:58.847386 2021] [mpm_prefork:notice] [pid 4461] AH00163: Apache/2.4.51 () PHP/7.4.21 configured -- resuming normal operations
[Thu Dec 23 07:18:58.847414 2021] [core:notice] [pid 4461] AH00094: Command line: '/usr/sbin/httpd'

如果我杀死这个“主”PID，那么我可以重新启动没问题。

# kill 4461
# systemctl restart httpd;systemctl status httpd;
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
   Active: active (running) since Thu 2021-12-23 20:01:31 UTC; 6ms ago
     Docs: man:httpd.service(8)
 Main PID: 3091 (httpd)
   Status: "Configuration loaded."
   CGroup: /system.slice/httpd.service
           └─3091 /usr/sbin/httpd -DFOREGROUND

Dec 23 20:01:31 ip-10-5-11-55.ec2.internal systemd[1]: Starting The Apache HTTP Server...
Dec 23 20:01:31 ip-10-5-11-55.ec2.internal systemd[1]: Started The Apache HTTP Server.
# ps -Af | grep httpd
root      3145     1  1 20:01 ?        00:00:00 /usr/sbin/httpd -DFOREGROUND
apache    3147  3145  0 20:01 ?        00:00:00 /usr/sbin/httpd -DFOREGROUND
apache    3153  3145  0 20:01 ?        00:00:00 /usr/sbin/httpd -DFOREGROUND
apache    3171  3145  0 20:01 ?        00:00:00 /usr/sbin/httpd -DFOREGROUND
apache    3177  3145  0 20:01 ?        00:00:00 /usr/sbin/httpd -DFOREGROUND
apache    3183  3145  0 20:01 ?        00:00:00 /usr/sbin/httpd -DFOREGROUND

大多数人的建议是“杀死进程”， https://serverfault.com/questions/825216/apache-failes-to-start-already-running-but-not-maching-pid-file但我需要这个才能工作无人看管。 我还能看什么？

Answer 1

尽管我进行了很多搜索，但没有找到针对其他 Linux 风格的答案。 当我注意到 httpd 最初以“apachectl”开头并且我试图使用“systemctl”重新启动并认为这可能是问题时，我得到了答案。 当我搜索这个时，我找到了很多答案。 这似乎是最简洁的： https://unix.stackexchange.com/questions/240528/apache-and-systemd

在其他人中，您会看到我遇到的相同问题，即一旦您开始使用 apachectl，您必须坚持使用它，因为 systemd 无法知道您对 apachectl 做了什么，因为它使用了不同的配置。