cfe_internal/recommendations.cf

bundle agent postgresql_conf_reccomendations
{
  meta:

   (policy_server|am_policy_hub).enterprise_edition::

    "tags" slist => { "cfengine_recommends" };

  vars:
    "pgsql_conf" string => "$(sys.statedir)/pg/data/postgresql.conf";
    "pgsql_conf" string => "/tmp/postgresql.conf";
    "mem_info_source" string => "/proc/meminfo";
      "mem_info_data"
        data => data_readstringarray( $(mem_info_source), "", "(:|\s+)", inf, inf),
        if => fileexists( $(mem_info_source) );

    "upper" string => "67108864"; # 64 * 1024 * 1024 in KB
    "lower" string => "3145728"; # 3 * 1024 * 1024 in KB

      "conf[maintenance_work_mem]"
        string => "2GB",
        if => isgreaterthan( "$(mem_info_data[MemTotal][1])", $(lower) ),
        comment => "If we have more than 2GB of memory available then we set the
        maintenance_work_memory to 2G to improve index creation, and
        vacuuming. Else we leave the default value.";

      "conf[shared_buffers]"
        string => "16GB",
        if => isgreaterthan( "$(mem_info_data[MemTotal][1])", $(upper) );

      "conf[effective_cache_size]"
        string => "11GB", # 70% of 16GB
        if => isgreaterthan( "$(mem_info_data[MemTotal][1])", $(upper) );

      "calculated_shared_buffers_MB"
        string => format( "%d0",
                          eval( "$(mem_info_data[MemTotal][1]) * 25 / 100 / 1024", "math", "infix"));

      "conf[shared_buffers]"
        string => concat( $(calculated_shared_buffers_MB), "MB"),
        if => and(
                   not( isvariable( "conf[maintenance_work_mem]" ) ),
                   not( isvariable( "conf[shared_buffers]" )));

      "calculated_effective_cache_size_MB"
        string => format( "%d0",
                          eval( "$(mem_info_data[MemTotal][1]) * 70 / 100 / 1024", "math", "infix"));

      "conf[effective_cache_size]"
        string => concat( $(calculated_effective_cache_size_MB), "MB"),
        if => and(
                   not( isvariable( "conf[maintenance_work_mem]" ) ),
                   not( isvariable( "conf[effective_cache_size]" )));

  files:
      "$(pgsql_conf)"
        edit_line => set_line_based("$(this.bundle).conf", "=", "\s*=\s*", ".*", "\s*#\s*"),
        action => warn_only;

  reports:
      "CFEngine Recommended Settings:";
      "shared_buffers = $(conf[shared_buffers])";
      "effective_cache_size = $(conf[effective_cache_size])";
      "maintenance_work_mem = $(conf[maintenance_work_mem])";
      "$(pgsql_conf) contains:"
        printfile => cat( $(pgsql_conf) );
}