Add firewall allow functionality RHEL

Centos7-Dockerfile

@@ -1,2 +1,3 @@
 FROM docker.io/pycontribs/centos:7
-RUN yum install -y iproute
+RUN yum install -y iproute firewalld python-firewall net-tools && \
+    systemctl enable firewalld

Centos8-Dockerfile

@@ -0,0 +1,6 @@
+# Centos8-Dockerfile
+FROM docker.io/pycontribs/centos:8
+RUN yum install -y iproute firewalld net-tools && \
+    systemctl disable nftables && \
+    systemctl enable firewalld && \
+    

defaults/main.yml

@@ -3,11 +3,15 @@ cmk_add_host: false # Should be true/false whether we should automatically add h
 cmk_omd_protocol: http # Should be http or https
 cmk_omd_host: your-checkmk-hostname
 cmk_omd_site: your-checkmk-site # e.g the first piece after the / following your hostname
+
 # If you have created a folder in WATO already you want hosts to be put in when registered
 # uncomment cmk_folder below and specify the folder to use.  Otherwise the role creates and 
 # adds new hosts by default to Unsorted folder
 # cmk_folder: your_folder_in_WATO
+
+# Copy paste the link address for rpm agent from CheckMK
 cmk_rpm_agent: http://url-from-your-agent-bakery-in-checkmk.rpm
+# Copy paste the link address for MSI (Windows) agent from CheckMK
 cmk_msi_agent: http://url-from-your-agent-bakery-in-checkmk.msi
 
 
@@ -18,6 +22,7 @@ cmk_username: some-username
 # I recommend encrypting this with ansible-vault. 
 # Example: ansible-vault encrypt_string somesecret_string --name cmk_secret
 cmk_secret: some-secret
+
 # Combined string required for unattended actions
 cmk_auth: "&_username={{ cmk_username }}&_secret={{ cmk_secret }}"
 

handlers/main.yml

@@ -9,3 +9,14 @@
 - name: cmk fresh install
   set_fact:
     cmk_fresh_install: True
+
+- name: ensure firewall open
+  firewalld:
+    port: 6556/tcp
+    state: enabled
+    permanent: yes
+    immediate: yes
+
+- name: ensure firewall reloaded
+  command: firewall-cmd --reload
+  changed_when: false

tasks/RedHat.yml

@@ -24,6 +24,8 @@
       notify:
         - restart xinetd
         - cmk fresh install
+        - ensure firewall open
+        - ensure firewall reloaded
 
     - name: Remove agent Download
       file: