I am currently doing this, want a better one :)

  - name: Changes to sysctl.conf
    lineinfile:
     dest=/tmp/1
     regexp="{{ item.regexp }}"
     line="{{ item.line }}"
    with_items:
     - { regexp: '^net.ipv6.conf.all.disable_ipv6', line: 
'net.ipv6.conf.all.disable_ipv6 = 1' }
     - { regexp: '^net.ipv4.tcp_no_metrics_save', line: 
'net.ipv4.tcp_no_metrics_save = 1' }
     - { regexp: '^net.ipv4.tcp_moderate_rcvbuf', line: 
'net.ipv4.tcp_moderate_rcvbuf = 1' }
     - { regexp: '^net.ipv4.tcp_fin_timeout', line: 
'net.ipv4.tcp_fin_timeout = 15' }
     - { regexp: '^net.ipv4.tcp_keepalive_time', line: 
'net.ipv4.tcp_keepalive_time = 1800' }
     - { regexp: '^net.ipv4.tcp_keepalive_probes', line: 
'net.ipv4.tcp_keepalive_probes = 4' }


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