質問編集履歴
1
エラーログの追記をしました。
    
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             2月 23 16:24:16 systemd[1]: Failed to start The Apache HTTP Server.
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| 22 22 | 
             
             2月 23 16:24:16 systemd[1]: Unit httpd.service entered failed state.
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| 23 23 | 
             
             2月 23 16:24:16 systemd[1]: httpd.service failed.
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            -
            ```
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            ```
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            **/etc/httpd/logs/error_log**
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            ```
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            [Fri Feb 23 20:30:51.023633 2018] [mpm_prefork:notice] [pid 21279] AH00170: caught SIGWINCH, shutting down gracefully
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            +
            [Fri Feb 23 20:30:52.105046 2018] [suexec:notice] [pid 22631] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
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            +
            [Fri Feb 23 20:30:52.109056 2018] [ssl:warn] [pid 22631] AH01916: Init: (tk2-223-21472.vs.sakura.ne.jp:443) You configured HTTP(80) on the standard HTTPS(443) port!
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            [Fri Feb 23 20:30:52.109113 2018] [ssl:warn] [pid 22631] AH02292: Init: Name-based SSL virtual hosts only work for clients with TLS server name indication support (RFC 4366)
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            [Fri Feb 23 20:30:52.160114 2018] [auth_digest:notice] [pid 22631] AH01757: generating secret for digest authentication ...
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            [Fri Feb 23 20:30:52.161075 2018] [lbmethod_heartbeat:notice] [pid 22631] AH02282: No slotmem from mod_heartmonitor
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            [Fri Feb 23 20:30:52.164405 2018] [ssl:warn] [pid 22631] AH01916: Init: (tk2-223-21472.vs.sakura.ne.jp:443) You configured HTTP(80) on the standard HTTPS(443) port!
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| 36 | 
            +
            [Fri Feb 23 20:30:52.164452 2018] [ssl:warn] [pid 22631] AH02292: Init: Name-based SSL virtual hosts only work for clients with TLS server name indication support (RFC 4366)
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            [Fri Feb 23 20:30:52.211336 2018] [mpm_prefork:notice] [pid 22631] AH00163: Apache/2.4.6 (CentOS) OpenSSL/1.0.1e-fips configured -- resuming normal operations
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            [Fri Feb 23 20:30:52.211395 2018] [core:notice] [pid 22631] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND'
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            ```
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            **/etc/httpd/logs/ssl_error_log**
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            ```
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            [Fri Feb 23 20:00:46.788435 2018] [ssl:emerg] [pid 21266] AH02240: Server should be SSL-aware but has no certificate configured [Hint: SSLCertificateFile] (/etc/httpd/conf.d/ssl.conf:56)
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            ```
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            ssl_error_logの56行目で「SSLEngine」をoffにすれば、apacheを起動することはできたのですがonにすると再度起動できなくなってしまいます。
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