ceph-defaults: fix handlers for mds and rgw

The way we handle the restart for both mds and rgw is not ideal, it will
try to restart the daemon on the host that don't run the daemon,
resulting in a service file being created (see bug description).

Now we restart each daemon precisely and in a serialized fashion.

Note: the current implementation does NOT support multiple mds or rgw on
the same node.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1469781
Signed-off-by: Sébastien Han <seb@redhat.com>

group_vars/all.yml.sample

@@ -327,7 +327,6 @@ dummy:
 #radosgw_dns_name: your.subdomain.tld # subdomains used by radosgw. See http://ceph.com/docs/master/radosgw/config/#enabling-subdomain-s3-calls
 #radosgw_resolve_cname: false # enable for radosgw to resolve DNS CNAME based bucket names
 #radosgw_civetweb_port: 8080
-#radosgw_civetweb_bind_ip: "{{ ansible_default_ipv4.address }}" # when using ipv6 enclose with brackets: "[{{ ansible_default_ipv6.address }}]"
 #radosgw_civetweb_num_threads: 100
 # For additional civetweb configuration options available such as SSL, logging,
 # keepalive, and timeout settings, please see the civetweb docs at
@@ -366,11 +365,23 @@ dummy:
 # Obviously between the checks (for monitors to be in quorum and for osd's pgs
 # to be clean) we have to wait. These retries and delays can be configurable
 # for both monitors and osds.
+#
+# Monitor handler checks
 #handler_health_mon_check_retries: 5
 #handler_health_mon_check_delay: 10
+#
+# OSD handler checks
 #handler_health_osd_check_retries: 40
 #handler_health_osd_check_delay: 30
 #handler_health_osd_check: true
+#
+# MDS handler checks
+#handler_health_mds_check_retries: 5
+#handler_health_mds_check_delay: 10
+#
+# RGW handler checks
+#handler_health_rgw_check_retries: 5
+#handler_health_rgw_check_delay: 10
 
 # Confiure the type of NFS gatway access.  At least one must be enabled for an
 # NFS role to be useful

group_vars/rhcs.yml.sample

@@ -327,7 +327,6 @@ ceph_repository: rhcs
 #radosgw_dns_name: your.subdomain.tld # subdomains used by radosgw. See http://ceph.com/docs/master/radosgw/config/#enabling-subdomain-s3-calls
 #radosgw_resolve_cname: false # enable for radosgw to resolve DNS CNAME based bucket names
 #radosgw_civetweb_port: 8080
-#radosgw_civetweb_bind_ip: "{{ ansible_default_ipv4.address }}" # when using ipv6 enclose with brackets: "[{{ ansible_default_ipv6.address }}]"
 #radosgw_civetweb_num_threads: 100
 # For additional civetweb configuration options available such as SSL, logging,
 # keepalive, and timeout settings, please see the civetweb docs at
@@ -366,11 +365,23 @@ ceph_repository: rhcs
 # Obviously between the checks (for monitors to be in quorum and for osd's pgs
 # to be clean) we have to wait. These retries and delays can be configurable
 # for both monitors and osds.
+#
+# Monitor handler checks
 #handler_health_mon_check_retries: 5
 #handler_health_mon_check_delay: 10
+#
+# OSD handler checks
 #handler_health_osd_check_retries: 40
 #handler_health_osd_check_delay: 30
 #handler_health_osd_check: true
+#
+# MDS handler checks
+#handler_health_mds_check_retries: 5
+#handler_health_mds_check_delay: 10
+#
+# RGW handler checks
+#handler_health_rgw_check_retries: 5
+#handler_health_rgw_check_delay: 10
 
 # Confiure the type of NFS gatway access.  At least one must be enabled for an
 # NFS role to be useful

roles/ceph-defaults/defaults/main.yml

@@ -319,7 +319,6 @@ mds_max_mds: 3
 #radosgw_dns_name: your.subdomain.tld # subdomains used by radosgw. See http://ceph.com/docs/master/radosgw/config/#enabling-subdomain-s3-calls
 radosgw_resolve_cname: false # enable for radosgw to resolve DNS CNAME based bucket names
 radosgw_civetweb_port: 8080
-radosgw_civetweb_bind_ip: "{{ ansible_default_ipv4.address }}" # when using ipv6 enclose with brackets: "[{{ ansible_default_ipv6.address }}]"
 radosgw_civetweb_num_threads: 100
 # For additional civetweb configuration options available such as SSL, logging,
 # keepalive, and timeout settings, please see the civetweb docs at
@@ -358,11 +357,23 @@ restapi_port: 5000
 # Obviously between the checks (for monitors to be in quorum and for osd's pgs
 # to be clean) we have to wait. These retries and delays can be configurable
 # for both monitors and osds.
+#
+# Monitor handler checks
 handler_health_mon_check_retries: 5
 handler_health_mon_check_delay: 10
+#
+# OSD handler checks
 handler_health_osd_check_retries: 40
 handler_health_osd_check_delay: 30
 handler_health_osd_check: true
+#
+# MDS handler checks
+handler_health_mds_check_retries: 5
+handler_health_mds_check_delay: 10
+#
+# RGW handler checks
+handler_health_rgw_check_retries: 5
+handler_health_rgw_check_delay: 10
 
 # Confiure the type of NFS gatway access.  At least one must be enabled for an
 # NFS role to be useful

roles/ceph-defaults/handlers/main.yml

@@ -64,28 +64,44 @@
     - inventory_hostname in play_hosts
     - osd_group_name in group_names
 
-- name: restart ceph mdss
-  service:
-    name: ceph-mds@{{ mds_name }}
-    state: restarted
-  # serial: 1 would be the proper solution here, but that can only be set on play level
-  # upstream issue: https://github.com/ansible/ansible/issues/12170
-  run_once: true
-  with_items: "{{ groups.get(mds_group_name, []) }}"
-  delegate_to: "{{ item }}"
+- name: copy mds restart script
+  template:
+    src: restart_mds_daemon.sh.j2
+    dest: /tmp/restart_mds_daemon.sh
+    owner: root
+    group: root
+    mode: 0750
+  listen: "restart ceph mdss"
   when:
+    - inventory_hostname in play_hosts
     - mds_group_name in group_names
 
-- name: restart ceph rgws
-  service:
-    name: ceph-radosgw@rgw.{{ ansible_hostname }}
-    state: restarted
-  # serial: 1 would be the proper solution here, but that can only be set on play level
-  # upstream issue: https://github.com/ansible/ansible/issues/12170
-  run_once: true
-  with_items: "{{ groups.get(rgw_group_name, []) }}"
-  delegate_to: "{{ item }}"
+- name: restart ceph mds daemon(s)
+  command: /tmp/restart_mds_daemon.sh
+  listen: "restart ceph mdss"
   when:
+    # We do not want to run these checks on initial deployment (`socket.rc == 0`)
+    - socket.rc == 0
+    - mds_group_name in group_names
+
+- name: copy rgw restart script
+  template:
+    src: restart_rgw_daemon.sh.j2
+    dest: /tmp/restart_rgw_daemon.sh
+    owner: root
+    group: root
+    mode: 0750
+  listen: "restart ceph rgws"
+  when:
+    - inventory_hostname in play_hosts
+    - rgw_group_name in group_names
+
+- name: restart ceph rgw daemon(s)
+  command: /tmp/restart_rgw_daemon.sh
+  listen: "restart ceph rgws"
+  when:
+    # We do not want to run these checks on initial deployment (`socket.rc == 0`)
+    - socket.rc == 0
     - rgw_group_name in group_names
 
 - name: restart ceph nfss

roles/ceph-defaults/templates/restart_mds_daemon.sh.j2

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+RETRIES="{{ handler_health_mds_check_retries }}"
+DELAY="{{ handler_health_mds_check_delay }}"
+MDS_NAME="{{ ansible_hostname }}"
+SOCKET=/var/run/ceph/{{ cluster }}-mds.${MDS_NAME}.asok
+
+# First, restart the daemon
+systemctl restart ceph-mds@${MDS_NAME}
+
+COUNT=10
+# Wait and ensure the socket exists after restarting the daemds
+while [ $RETRIES -ne 0 ]; do
+  {{ docker_exec_cmd }} test -S $SOCKET && exit 0
+  sleep $DELAY
+  let RETRIES=RETRIES-1
+done
+# If we reach this point, it means the socket is not present.
+echo "Socket file ${SOCKET} could not be found, which means the Metadata Server is not running."
+exit 1

roles/ceph-defaults/templates/restart_rgw_daemon.sh.j2

@@ -0,0 +1,65 @@
+#!/bin/bash
+
+RETRIES="{{ handler_health_rgw_check_retries }}"
+DELAY="{{ handler_health_rgw_check_delay }}"
+RGW_NAME="{{ ansible_hostname }}"
+RGW_PORT="{{ radosgw_civetweb_port }}"
+SOCKET=/var/run/ceph/{{ cluster }}-client.rgw.${RGW_NAME}.asok
+
+{% if radosgw_address_block | length > 0 %}
+  {% if ip_version == 'ipv4' -%}
+RGW_IP={{ hostvars[inventory_hostname]['ansible_all_' + ip_version + '_addresses'] | ipaddr(radosgw_address_block) | first }}
+  {%- elif ip_version == 'ipv6' -%}
+RGW_IP=[{{ hostvars[inventory_hostname]['ansible_all_' + ip_version + '_addresses'] | ipaddr(radosgw_address_block) | first }}]
+  {%- endif %}
+{% elif hostvars[inventory_hostname]['radosgw_address'] is defined and hostvars[inventory_hostname]['radosgw_address'] != '0.0.0.0' -%}
+  {% if ip_version == 'ipv4' -%}
+RGW_IP={{ hostvars[inventory_hostname]['radosgw_address'] }}
+  {%- elif ip_version == 'ipv6' -%}
+RGW_IP=[{{ hostvars[inventory_hostname]['radosgw_address'] }}]
+  {% endif %}
+{%- else -%}
+  {% set interface = ["ansible_",radosgw_interface]|join %}
+  {% if ip_version == 'ipv6' -%}
+RGW_IP=[{{ hostvars[inventory_hostname][interface][ip_version][0]['address'] }}]
+  {%- elif ip_version == 'ipv4' -%}
+RGW_IP={{ hostvars[inventory_hostname][interface][ip_version]['address'] }}
+  {% endif %}
+{%- endif %}
+
+check_for_curl_or_wget() {
+  if {{ docker_exec_cmd }} command -v wget &>/dev/null; then
+    rgw_test_command="wget --quiet"
+  elif {{ docker_exec_cmd }} command -v curl &>/dev/null; then
+    rgw_test_command="curl --fail --silent --output /dev/null"
+  else
+    echo "It seems that neither curl or wget are available on your system."
+    echo "Cannot test rgw connection."
+    exit 0
+  fi
+}
+
+check_rest() {
+  check_for_curl_or_wget
+  while [ $RETRIES -ne 0 ]; do
+    test "$rgw_test_command http://$RGW_IP:$RGW_PORT" && exit 0
+    sleep $DELAY
+    let RETRIES=RETRIES-1
+  done
+  # If we reach this point, it means there is a problem with the connection to rgw
+  echo "Error connecting locally to Rados Gateway service: http://$rgw_listen"
+  exit 1
+}
+
+# First, restart the daemon
+systemctl restart ceph-radosgw@rgw.${RGW_NAME}
+
+COUNT=10
+# Wait and ensure the socket exists after restarting the daemon
+while [ $COUNT -ne 0 ]; do
+  {{ docker_exec_cmd }} test -S $SOCKET && check_rest
+  sleep 1
+  let COUNT=COUNT-1
+done
+echo "Socket file ${SOCKET} could not be found, which means Rados Gateway is not running."
+exit 1