gitlab-ctl reconfigure 报错

Recipe: monitoring::user
  * account[Prometheus user and group] action create
    * group[Prometheus user and group] action create
      
      ================================================================================
      Error executing action `create` on resource 'group[Prometheus user and group]'
      ================================================================================
      
      Errno::ENOMEM
      -------------
      Cannot allocate memory - fork(2)
      
      Resource Declaration:
      ---------------------
      # In /opt/gitlab/embedded/cookbooks/cache/cookbooks/package/resources/account.rb
      
       38:     group new_resource.name do
       39:       group_name new_resource.groupname
       40:       gid new_resource.gid
       41:       system new_resource.system
       42:       if new_resource.append_to_group
       43:         append true
       44:         members new_resource.group_members
       45:       end
       46:       action :create
      
      Compiled Resource:
      ------------------
      # Declared in /opt/gitlab/embedded/cookbooks/cache/cookbooks/package/resources/account.rb:38:in `block in class_from_file'
      
      group("Prometheus user and group") do
        action [:create]
        default_guard_interpreter :default
        declared_type :group
        cookbook_name "monitoring"
        group_name "gitlab-prometheus"
        gid nil
        system true
        members []
        excluded_members []
      end
      
      System Info:
      ------------
      chef_version=14.13.11
      platform=centos
      platform_version=7.4.1708
      ruby=ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-linux]
      program_name=/opt/gitlab/embedded/bin/chef-client
      executable=/opt/gitlab/embedded/bin/chef-client
      
    
    ================================================================================
    Error executing action `create` on resource 'account[Prometheus user and group]'
    ================================================================================
    
    Errno::ENOMEM
    -------------
    group[Prometheus user and group] (/opt/gitlab/embedded/cookbooks/cache/cookbooks/package/resources/account.rb line 38) had an error: Errno::ENOMEM: Cannot allocate memory - fork(2)
    
    Resource Declaration:
    ---------------------
    # In /opt/gitlab/embedded/cookbooks/cache/cookbooks/monitoring/recipes/user.rb
    
     22: account "Prometheus user and group" do
     23:   username prometheus_user
     24:   uid node['monitoring']['prometheus']['uid']
     25:   ugid prometheus_group
     26:   groupname prometheus_group
     27:   home prometheus_dir
     28:   gid node['monitoring']['prometheus']['gid']
     29:   shell node['monitoring']['prometheus']['shell']
     30:   manage node['gitlab']['manage-accounts']['enable']
     31: end
    
    Compiled Resource:
    ------------------
    # Declared in /opt/gitlab/embedded/cookbooks/cache/cookbooks/monitoring/recipes/user.rb:22:in `from_file'
    
    account("Prometheus user and group") do
      action [:create]
      default_guard_interpreter :default
      declared_type :account
      cookbook_name "monitoring"
      recipe_name "user"
      username "gitlab-prometheus"
      uid nil
      ugid "gitlab-prometheus"
      groupname "gitlab-prometheus"
      gid nil
      shell "/bin/sh"
      home "/var/opt/gitlab/prometheus"
      manage true
    end
    
    System Info:
    ------------
    chef_version=14.13.11
    platform=centos
    platform_version=7.4.1708
    ruby=ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-linux]
    program_name=/opt/gitlab/embedded/bin/chef-client
    executable=/opt/gitlab/embedded/bin/chef-client
    

Running handlers:
There was an error running gitlab-ctl reconfigure:

account[Prometheus user and group] (monitoring::user line 22) had an error: Errno::ENOMEM: group[Prometheus user and group] (/opt/gitlab/embedded/cookbooks/cache/cookbooks/package/resources/account.rb line 38) had an error: Errno::ENOMEM: Cannot allocate memory - fork(2)

Running handlers complete
Chef Client failed. 13 resources updated in 22 seconds

解决办法：
这种是应为内存太小，加大内存，建议4G以上，再次执行，就没有报错了