replace_node: Replace a gluster node with a new one with same name

Author: sac

README.md

@@ -1 +1,38 @@
-# gluster-ansible-maintenance
+Role Name
+=========
+
+A brief description of the role goes here.
+
+Requirements
+------------
+
+Any pre-requisites that may not be covered by Ansible itself or the role should be mentioned here. For instance, if the role uses the EC2 module, it may be a good idea to mention in this section that the boto package is required.
+
+Role Variables
+--------------
+
+A description of the settable variables for this role should go here, including any variables that are in defaults/main.yml, vars/main.yml, and any variables that can/should be set via parameters to the role. Any variables that are read from other roles and/or the global scope (ie. hostvars, group vars, etc.) should be mentioned here as well.
+
+Dependencies
+------------
+
+A list of other roles hosted on Galaxy should go here, plus any details in regards to parameters that may need to be set for other roles, or variables that are used from other roles.
+
+Example Playbook
+----------------
+
+Including an example of how to use your role (for instance, with variables passed in as parameters) is always nice for users too:
+
+    - hosts: servers
+      roles:
+         - { role: username.rolename, x: 42 }
+
+License
+-------
+
+BSD
+
+Author Information
+------------------
+
+An optional section for the role authors to include contact information, or a website (HTML is not allowed).

defaults/main.yml

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+---
+# defaults file for gluster-ansible-maintenance

examples/replace_node.yml

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+---
+- remote_user: root
+  gather_facts: no
+  hosts: server
+  vars:
+    - gluster_maintenance_old_node: store
+    - gluster_maintenance_new_node: store
+    - gluster_maintenance_cluster_node: data
+  roles:
+    - gluster.maintenance
+

handlers/main.yml

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+---
+# handlers file for gluster-ansible-maintenance

meta/main.yml

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+galaxy_info:
+  author: your name
+  description: your description
+  company: your company (optional)
+
+  # If the issue tracker for your role is not on github, uncomment the
+  # next line and provide a value
+  # issue_tracker_url: http://example.com/issue/tracker
+
+  # Some suggested licenses:
+  # - BSD (default)
+  # - MIT
+  # - GPLv2
+  # - GPLv3
+  # - Apache
+  # - CC-BY
+  license: license (GPLv2, CC-BY, etc)
+
+  min_ansible_version: 1.2
+
+  # If this a Container Enabled role, provide the minimum Ansible Container version.
+  # min_ansible_container_version:
+
+  # Optionally specify the branch Galaxy will use when accessing the GitHub
+  # repo for this role. During role install, if no tags are available,
+  # Galaxy will use this branch. During import Galaxy will access files on
+  # this branch. If Travis integration is configured, only notifications for this
+  # branch will be accepted. Otherwise, in all cases, the repo's default branch
+  # (usually master) will be used.
+  #github_branch:
+
+  #
+  # platforms is a list of platforms, and each platform has a name and a list of versions.
+  #
+  # platforms:
+  # - name: Fedora
+  #   versions:
+  #   - all
+  #   - 25
+  # - name: SomePlatform
+  #   versions:
+  #   - all
+  #   - 1.0
+  #   - 7
+  #   - 99.99
+
+  galaxy_tags: []
+    # List tags for your role here, one per line. A tag is a keyword that describes
+    # and categorizes the role. Users find roles by searching for tags. Be sure to
+    # remove the '[]' above, if you add tags to this list.
+    #
+    # NOTE: A tag is limited to a single word comprised of alphanumeric characters.
+    #       Maximum 20 tags per role.
+
+dependencies: []
+  # List your role dependencies here, one per line. Be sure to remove the '[]' above,
+  # if you add dependencies to this list.

roles/replace_node/#README.md#

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+Role Name
+=========
+
+replace_node - Replace gluster node with a new node.
+
+Requirements
+------------
+
+- Ansible >= 2.6
+- lvm2 (Optional)
+
+NOTE: Inventory should contain a single node, which should be part of the cluster. This node should be different than any of the three variables explained below, this requirement is to collect the right peers for the new node.
+
+Role Variables
+--------------
+
+| Name                     |Choices| Default value         | Comments                          |
+|--------------------------|-------|-----------------------|-----------------------------------|
+| gluster_maintenance_old_node |    | UNDEF   | The node which has to be replaced with a new node. Just the node name is needed to get the peer id, the node need not be accessible. Provide the name that was used to probe the peers. |
+| gluster_maintenance_new_node |   | UNDEF | New node which will replace the old node. This name can be same as the old node or different name. |
+| gluster_maintenance_cluster_node |  | UNDEF | The node on which the peer, volume-id details are collected. This node should be part of the trusted storage pool. And should be different from old_node or new_node. |
+
+
+
+Dependencies
+------------
+
+Depends on:
+
+- gluster.repositories (Optional: to subscribe to channels)
+- gluster.infra (Optional: to setup bricks)
+
+Example Playbook
+----------------
+
+Note that `server' in the inventory and the variable gluster_maintenance_cluster_node are unique (if the number of nodes are more than 2).
+
+```
+---
+- remote_user: root
+  gather_facts: no
+  hosts: server
+  vars:
+    - gluster_maintenance_old_node: store
+    - gluster_maintenance_new_node: store
+    - gluster_maintenance_cluster_node: data
+  roles:
+    - gluster.maintenance
+```
+
+In the above example, a new host named store will replace the old host (the replaced node has the same hostname as the old node, however ensure that old node is not accessible with the hostname, else 
+
+
+License
+-------
+
+GPLv3

roles/replace_node/.#README.md

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+[email protected].17865:1533605177

roles/replace_node/README.md

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+Role Name
+=========
+
+replace_node - Replace gluster node with a new node.
+
+Requirements
+------------
+
+- Ansible >= 2.6
+- lvm2 (Optional)
+
+NOTE: Inventory should contain a single node, which should be part of the cluster. This node should be different than any of the three variables explained below, this requirement is to collect the right peers for the new node.
+
+Role Variables
+--------------
+
+| Name                     |Choices| Default value         | Comments                          |
+|--------------------------|-------|-----------------------|-----------------------------------|
+| gluster_maintenance_old_node |    | UNDEF   | The node which has to be replaced with a new node. Just the node name is needed to get the peer id, the node need not be accessible. Provide the name that was used to probe the peers. |
+| gluster_maintenance_new_node |   | UNDEF | New node which will replace the old node. This name can be same as the old node or different name. |
+| gluster_maintenance_cluster_node |  | UNDEF | The node on which the peer, volume-id details are collected. This node should be part of the trusted storage pool. And should be different from old_node or new_node. |
+
+
+
+Dependencies
+------------
+
+Depends on:
+
+- gluster.repositories (Optional: to subscribe to channels)
+- gluster.infra (Optional: to setup bricks)
+
+Example Playbook
+----------------
+
+Note that `server' in the inventory and the variable gluster_maintenance_cluster_node are unique (if the number of nodes are more than 2).
+
+```
+---
+- remote_user: root
+  gather_facts: no
+  hosts: server
+  vars:
+    - gluster_maintenance_old_node: store
+    - gluster_maintenance_new_node: store
+    - gluster_maintenance_cluster_node: data
+  roles:
+    - gluster.maintenance
+```
+
+
+License
+-------
+
+GPLv3

roles/replace_node/defaults/main.yml

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+---
+# defaults file for replace_node

roles/replace_node/handlers/main.yml

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+---
+# handlers file for replace_node

roles/replace_node/meta/main.yml

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+galaxy_info:
+  author: your name
+  description: your description
+  company: your company (optional)
+
+  # If the issue tracker for your role is not on github, uncomment the
+  # next line and provide a value
+  # issue_tracker_url: http://example.com/issue/tracker
+
+  # Some suggested licenses:
+  # - BSD (default)
+  # - MIT
+  # - GPLv2
+  # - GPLv3
+  # - Apache
+  # - CC-BY
+  license: license (GPLv2, CC-BY, etc)
+
+  min_ansible_version: 1.2
+
+  # If this a Container Enabled role, provide the minimum Ansible Container version.
+  # min_ansible_container_version:
+
+  # Optionally specify the branch Galaxy will use when accessing the GitHub
+  # repo for this role. During role install, if no tags are available,
+  # Galaxy will use this branch. During import Galaxy will access files on
+  # this branch. If Travis integration is configured, only notifications for this
+  # branch will be accepted. Otherwise, in all cases, the repo's default branch
+  # (usually master) will be used.
+  #github_branch:
+
+  #
+  # platforms is a list of platforms, and each platform has a name and a list of versions.
+  #
+  # platforms:
+  # - name: Fedora
+  #   versions:
+  #   - all
+  #   - 25
+  # - name: SomePlatform
+  #   versions:
+  #   - all
+  #   - 1.0
+  #   - 7
+  #   - 99.99
+
+  galaxy_tags: []
+    # List tags for your role here, one per line. A tag is a keyword that describes
+    # and categorizes the role. Users find roles by searching for tags. Be sure to
+    # remove the '[]' above, if you add tags to this list.
+    #
+    # NOTE: A tag is limited to a single word comprised of alphanumeric characters.
+    #       Maximum 20 tags per role.
+
+dependencies: []
+  # List your role dependencies here, one per line. Be sure to remove the '[]' above,
+  # if you add dependencies to this list.

roles/replace_node/tasks/main.yml

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+---
+# Create tmp dir for storing peer data
+- name: Create temporary storage directory
+  tempfile:
+    state: directory
+    suffix: _peer
+  register: tmpdir
+  delegate_to: 127.0.0.1
+  run_once: True
+
+# Set the glusterd location
+- name: Set the path of glusterd.info file
+  set_fact:
+    glusterd_libdir: "/var/lib/glusterd"
+    peer_tmp_dir: "{{ tmpdir['path'] }}"
+
+- import_tasks: peers.yml
+
+- import_tasks: volume.yml
+
+# Ensure to delete the temporary directory
+- name: Delete the temporary directory
+  file:
+     state: absent
+     path: "{{ peer_tmp_dir }}"
+  delegate_to: 127.0.0.1
+  run_once: True

roles/replace_node/tasks/peers.yml

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+---
+- name: Fetch the UUID of the old node
+  shell: >
+    gluster peer status |
+    grep -A1 {{ gluster_maintenance_old_node | mandatory }} |
+    awk -F: '/uid/ { print $2}'
+  register: old_node_uuid
+  run_once: true
+
+- name: Get the UUID of master
+  shell: awk -F= '/UUID/{print $2}' "{{ glusterd_libdir }}/glusterd.info"
+  register: master_uuid
+  run_once: true
+
+- name: Store the UUID
+  set_fact:
+    old_uuid: "{{ old_node_uuid.stdout | trim }}"
+    master_uuid: "{{ master_uuid.stdout }}"
+
+- name: Edit the new node's gluster.info
+  lineinfile:
+    path: "{{ glusterd_libdir }}/glusterd.info"
+    regexp: '^UUID='
+    line: "UUID={{ old_uuid }}"
+  delegate_to: "{{ gluster_maintenance_new_node | mandatory }}"
+
+- name: Copy the peer data into local
+  synchronize:
+    mode: pull
+    src: "{{ glusterd_libdir }}/peers"
+    dest: "{{ peer_tmp_dir }}"
+  run_once: true
+
+- name: Copy the peer data of master node
+  fetch:
+    flat: yes
+    src: "{{ glusterd_libdir }}/peers/{{ master_uuid }}"
+    dest: "{{ peer_tmp_dir }}/peers/{{ master_uuid }}"
+  delegate_to: "{{ gluster_maintenance_cluster_node | mandatory }}"
+
+- name: Delete the peer of the old node
+  file:
+    state: absent
+    path: "{{ peer_tmp_dir }}/peers/{{ old_uuid }}"
+  delegate_to: 127.0.0.1
+
+- name: Copy the peer data to remote node
+  copy:
+    src: "{{ peer_tmp_dir }}/peers/"
+    dest: "{{ glusterd_libdir }}/peers"
+  delegate_to: "{{ gluster_maintenance_new_node }}"