Add rsyncd image and related Ansible for Swift

Swift replicator services require rsync to function. This patch adds a
new container which is included automatically on each of the Swift
storage nodes.

Change-Id: If10fbe610ca4df21ef0f2c7a1025035d627cb4ba
Partial-Bug: #1477993

ansible/roles/swift/defaults/main.yml

@@ -40,6 +40,10 @@ swift_object_updater_image: "{{ docker_registry ~ '/' if docker_registry else ''
 swift_object_updater_tag: "{{ openstack_release }}"
 swift_object_updater_image_full: "{{ swift_object_updater_image }}:{{ swift_object_updater_tag }}"
 
+swift_rsyncd_image: "{{ docker_registry ~ '/' if docker_registry else '' }}{{ docker_namespace }}/{{ kolla_base_distro }}-{{ kolla_install_type }}-swift-rsyncd"
+swift_rsyncd_tag: "{{ openstack_release }}"
+swift_rsyncd_image_full: "{{ swift_rsyncd_image }}:{{ swift_rsyncd_tag }}"
+
 ####################
 # Openstack
 ####################

ansible/roles/swift/tasks/config.yml

@@ -82,3 +82,14 @@
         dest: "{{ node_config_directory }}/swift/container.ring.gz" }
     - { src: "/etc/kolla/config/swift/account.ring.gz",
         dest: "{{ node_config_directory }}/swift/account.ring.gz" }
+
+- name: Ensuring swift-rsyncd config directory exists
+  file:
+    path: "{{ node_config_directory }}/swift-rsyncd/"
+    state: "directory"
+    recurse: "yes"
+
+- name: Copying over swift-rsyncd config(s)
+  template:
+    src: "rsyncd.conf.j2"
+    dest: "{{ node_config_directory }}/swift-rsyncd/rsyncd.conf"

ansible/roles/swift/tasks/start.yml

 ---
+- name: Starting Swift-rsyncd container
+  docker:
+    docker_api_version: "{{ docker_api_version }}"
+    net: host
+    pull: "{{ docker_pull_policy }}"
+    restart_policy: "{{ docker_restart_policy }}"
+    restart_policy_retry: "{{ docker_restart_policy_retry }}"
+    state: reloaded
+    registry: "{{ docker_registry }}"
+    username: "{{ docker_registry_username }}"
+    password: "{{ docker_registry_password }}"
+    insecure_registry: "{{ docker_insecure_registry }}"
+    name: swift_rsyncd
+    image: "{{ swift_rsyncd_image_full }}"
+    volumes: "{{ node_config_directory }}/swift-rsyncd/:/opt/kolla/swift-rsyncd/:ro"
+    volumes_from:
+      - swift_data
+    env:
+      KOLLA_CONFIG_STRATEGY: "{{ config_strategy }}"
+
 - name: Starting Swift Proxy Server container
   docker:
     docker_api_version: "{{ docker_api_version }}"

ansible/roles/swift/templates/rsyncd.conf.j2

+uid = swift
+gid = swift
+address = {{ hostvars[inventory_hostname]['ansible_' + api_interface]['ipv4']['address'] }}
+
+{% if inventory_hostname in groups['swift-account-server'] %}
+[account]
+max connections = 2
+path = {{ swift_devices_mount_point }}
+read only = false
+lock file = /var/lock/account.lock
+{% endif %}
+
+{% if inventory_hostname in groups['swift-container-server'] %}
+[container]
+max connections = 4
+path = {{ swift_devices_mount_point }}
+read only = false
+lock file = /var/lock/container.lock
+{% endif %}
+
+{% if inventory_hostname in groups['swift-object-server'] %}
+[object]
+max connections = 8
+path = {{ swift_devices_mount_point }}
+read only = false
+lock file = /var/lock/object.lock
+{% endif %}

docker/swift/swift-rsyncd/Dockerfile.j2

+FROM {{ namespace }}/{{ base_distro }}-{{ install_type }}-swift-base:{{ tag }}
+MAINTAINER Kolla Project (https://launchpad.net/kolla)
+
+{% if base_distro in ['fedora', 'centos', 'oraclelinux'] %}
+
+RUN yum install -y rsync \
+    && yum clean all
+
+{% elif base_distro in ['ubuntu', 'debian'] %}
+
+RUN apt-get install -y --no-install-recommends \
+        rsync \
+    && apt-get clean
+
+{% endif %}
+
+COPY start.sh /
+COPY config-external.sh /opt/kolla/
+
+CMD ["/start.sh"]
+
+{{ include_footer }}

docker/swift/swift-rsyncd/config-external.sh

+#!/bin/bash
+
+OWNER="swift"
+
+if [[ -f "/opt/kolla/swift-rsyncd/rsyncd.conf" ]]; then
+    cp /opt/kolla/swift-rsyncd/rsyncd.conf /etc/rsyncd.conf
+    chown ${OWNER}: /etc/rsyncd.conf
+    chmod 0640 /etc/rsyncd.conf
+fi

docker/swift/swift-rsyncd/start.sh

+#!/bin/bash
+
+set -o errexit
+
+CMD="/usr/bin/rsync"
+ARGS="--daemon --no-detach --config=/etc/rsyncd.conf"
+
+# Loading common functions.
+source /opt/kolla/kolla-common.sh
+
+# Execute config strategy
+set_configs
+
+exec $CMD $ARGS