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Nginx configuration check fails: the size 5242880 of shared memory zone "SSL" conflicts with already declared size 1048576

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George Alibegashvili
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Plesk for Linux kb: technical ABT: Group A

Applicable to:

  • Plesk for Linux

Symptoms

  • Nginx configuration check fails with the error below:

    CONFIG_TEXT: [emerg] the size 5242880 of shared memory zone "SSL" conflicts with already declared size 1048576 in /etc/nginx/plesk.conf.d/vhosts/example.com.conf

Cause

The custom ssl_session_cache configured in /etc/nginx/nginx.conf or /etc/nginx/conf.d/ssl.conf file prevents generation of the configuration file.

Resolution

  1. Connect to the server via SSH

  2. Edit file /etc/nginx/nginx.conf or /etc/nginx/conf.d/ssl.conf.

  3. Comment the line below by changing it from:

    ssl_session_cache shared:SSL:1m;

    To

    #ssl_session_cache shared:SSL:1m;

  4. Restart the Nginx service:

    # service nginx restart

In some cases custom configuration added for particular domain. Check it with strace:

# strace -ffs4096 nginx -t 2>&1 | less <...> open("/var/www/vhosts/system/example.com/conf/vhost_nginx.conf", O_RDONLY) = 7 fstat(7, {st_mode=S_IFREG|0600, st_size=77, ...}) = 0 pread64(7, "ssl_session_cache shared:SSL:10m;\nssl_session_timeout 1h;\nssl_buffer_size 4k;", 77, 0) = 77

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