add role ssh-keepalive, which uses keepalive packets to prevent firewalls...

add role ssh-keepalive, which uses  keepalive packets to prevent firewalls closing inactive ssh connections


Former-commit-id: 666dc3bd

roles/ssh-keepalive/handlers/main.yml

+- name: "restart sshd"
+  service: name=sshd state=restarted
+  sudo: true
+  when: ansible_os_family == "RedHat"
+
+- name: "restart ssh"
+  service: name=ssh state=restarted
+  sudo: true
+  when: ansible_os_family == "Debian"

roles/ssh-keepalive/tasks/main.yml

+- name: "Set ClientAliveInterval"
+  lineinfile:
+  args:
+    dest: /etc/ssh/sshd_config
+    regexp: "#?ClientAliveInterval [0-9]+"
+    line: "ClientAliveInterval 60" 
+    backrefs: yes
+  sudo: true
+  notify: 
+  - restart sshd
+  - restart ssh
+
+- name: "SetClientAliveCountMax"
+  lineinfile:
+  args:
+    dest: /etc/ssh/sshd_config
+    regexp: "#?ClientAliveCountMax [0-9]+"
+    line: "ClientAliveCountMax 5" 
+    backrefs: yes
+  sudo: true
+  notify: 
+  - restart sshd
+  - restart ssh
+