CentOS再起動後にApacheが起動できない時の対処法

まずhttpdのプロセスが残っているかの確認

[root@localhost ~]# lsof -i | grep http

httpd    1162 root    4u  IPv6   8530      0t0  TCP *:http (LISTEN)

httpd    1162 root    6u  IPv6   8534      0t0  TCP *:https (LISTEN)

残っていればプロセスをkill

[root@localhost ~]# kill -9 1162

httpd起動時にssl のパスワードを聞かれるのでssl設定時のパスワードを入力

[root@localhost ~]# /etc/init.d/httpd start

httpd を起動中: httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain for ServerName

Apache/2.2.15 mod_ssl/2.2.15 (Pass Phrase Dialog)

Some of your private key files are encrypted for security reasons.

In order to read them you have to provide the pass phrases.

Server localhost.localdomain:443 (RSA)

Enter pass phrase:openssl

これでhttpdの起動となった