4장. Pacemaker를 사용하여 고가용성 서비스 관리

Pacemaker는 RHOSP(Red Hat OpenStack Platform) 서비스를 Bundle Set 리소스 또는 번들로 관리합니다. 이러한 서비스 대부분은 동일한 방식으로 시작되고 항상 각 컨트롤러 노드에서 실행되는 활성-활성 서비스입니다.

Pacemaker는 다음 리소스 유형을 관리합니다.

다음 예제는 pcs status 명령의 출력에서 간단한 번들 목록을 보여줍니다.

Docker container set: haproxy-bundle [192.168.24.1:8787/rhosp-rhel7/openstack-haproxy:pcmklatest]
  haproxy-bundle-docker-0      (ocf::heartbeat:docker):        Started overcloud-controller-0
  haproxy-bundle-docker-1      (ocf::heartbeat:docker):        Started overcloud-controller-1
  haproxy-bundle-docker-2      (ocf::heartbeat:docker):        Started overcloud-controller-2

각 번들에 대해 다음 세부 정보를 볼 수 있습니다.

다음 예제는 haproxy-bundle 간단한 번들의 설정을 보여줍니다.

$ sudo pcs resource show haproxy-bundle
Bundle: haproxy-bundle
 Docker: image=192.168.24.1:8787/rhosp-rhel7/openstack-haproxy:pcmklatest network=host options="--user=root --log-driver=journald -e KOLLA_CONFIG_STRATEGY=COPY_ALWAYS" replicas=3 run-command="/bin/bash /usr/local/bin/kolla_start"
 Storage Mapping:
  options=ro source-dir=/var/lib/kolla/config_files/haproxy.json target-dir=/var/lib/kolla/config_files/config.json (haproxy-cfg-files)
  options=ro source-dir=/var/lib/config-data/puppet-generated/haproxy/ target-dir=/var/lib/kolla/config_files/src (haproxy-cfg-data)
  options=ro source-dir=/etc/hosts target-dir=/etc/hosts (haproxy-hosts)
  options=ro source-dir=/etc/localtime target-dir=/etc/localtime (haproxy-localtime)
  options=ro source-dir=/etc/pki/ca-trust/extracted target-dir=/etc/pki/ca-trust/extracted (haproxy-pki-extracted)
  options=ro source-dir=/etc/pki/tls/certs/ca-bundle.crt target-dir=/etc/pki/tls/certs/ca-bundle.crt (haproxy-pki-ca-bundle-crt)
  options=ro source-dir=/etc/pki/tls/certs/ca-bundle.trust.crt target-dir=/etc/pki/tls/certs/ca-bundle.trust.crt (haproxy-pki-ca-bundle-trust-crt)
  options=ro source-dir=/etc/pki/tls/cert.pem target-dir=/etc/pki/tls/cert.pem (haproxy-pki-cert)
  options=rw source-dir=/dev/log target-dir=/dev/log (haproxy-dev-log)

이 예제에서는 번들의 컨테이너에 대한 다음 정보를 보여줍니다.

이 구성은 실행되는 컨트롤러 노드에 따라 다른 상태를 가질 수 있는 서비스인 Multi-State 리소스를 관리하는 데 필요합니다.

이 예제에서는 pcs status 명령의 출력에서 복잡한 번들 목록을 보여줍니다.

Docker container set: rabbitmq-bundle [192.168.24.1:8787/rhosp-rhel7/openstack-rabbitmq:pcmklatest]
  rabbitmq-bundle-0    (ocf::heartbeat:rabbitmq-cluster):      Started overcloud-controller-0
  rabbitmq-bundle-1    (ocf::heartbeat:rabbitmq-cluster):      Started overcloud-controller-1
  rabbitmq-bundle-2    (ocf::heartbeat:rabbitmq-cluster):      Started overcloud-controller-2
Docker container set: galera-bundle [192.168.24.1:8787/rhosp-rhel7/openstack-mariadb:pcmklatest]
  galera-bundle-0      (ocf::heartbeat:galera):        Master overcloud-controller-0
  galera-bundle-1      (ocf::heartbeat:galera):        Master overcloud-controller-1
  galera-bundle-2      (ocf::heartbeat:galera):        Master overcloud-controller-2
Docker container set: redis-bundle [192.168.24.1:8787/rhosp-rhel7/openstack-redis:pcmklatest]
  redis-bundle-0       (ocf::heartbeat:redis): Master overcloud-controller-0
  redis-bundle-1       (ocf::heartbeat:redis): Slave overcloud-controller-1
  redis-bundle-2       (ocf::heartbeat:redis): Slave overcloud-controller-2

이 출력은 각 복잡한 번들에 대한 다음 정보를 보여줍니다.

다음 예제에서는 galera-bundle 복잡한 번들의 설정을 보여줍니다.

[...]
Bundle: galera-bundle
 Docker: image=192.168.24.1:8787/rhosp-rhel7/openstack-mariadb:pcmklatest masters=3 network=host options="--user=root --log-driver=journald -e KOLLA_CONFIG_STRATEGY=COPY_ALWAYS" replicas=3 run-command="/bin/bash /usr/local/bin/kolla_start"
 Network: control-port=3123
 Storage Mapping:
  options=ro source-dir=/var/lib/kolla/config_files/mysql.json target-dir=/var/lib/kolla/config_files/config.json (mysql-cfg-files)
  options=ro source-dir=/var/lib/config-data/puppet-generated/mysql/ target-dir=/var/lib/kolla/config_files/src (mysql-cfg-data)
  options=ro source-dir=/etc/hosts target-dir=/etc/hosts (mysql-hosts)
  options=ro source-dir=/etc/localtime target-dir=/etc/localtime (mysql-localtime)
  options=rw source-dir=/var/lib/mysql target-dir=/var/lib/mysql (mysql-lib)
  options=rw source-dir=/var/log/mariadb target-dir=/var/log/mariadb (mysql-log-mariadb)
  options=rw source-dir=/dev/log target-dir=/dev/log (mysql-dev-log)
 Resource: galera (class=ocf provider=heartbeat type=galera)
  Attributes: additional_parameters=--open-files-limit=16384 cluster_host_map=overcloud-controller-0:overcloud-controller-0.internalapi.localdomain;overcloud-controller-1:overcloud-controller-1.internalapi.localdomain;overcloud-controller-2:overcloud-controller-2.internalapi.localdomain enable_creation=true wsrep_cluster_address=gcomm://overcloud-controller-0.internalapi.localdomain,overcloud-controller-1.internalapi.localdomain,overcloud-controller-2.internalapi.localdomain
  Meta Attrs: container-attribute-target=host master-max=3 ordered=true
  Operations: demote interval=0s timeout=120 (galera-demote-interval-0s)
              monitor interval=20 timeout=30 (galera-monitor-interval-20)
              monitor interval=10 role=Master timeout=30 (galera-monitor-interval-10)
              monitor interval=30 role=Slave timeout=30 (galera-monitor-interval-30)
              promote interval=0s on-fail=block timeout=300s (galera-promote-interval-0s)
              start interval=0s timeout=120 (galera-start-interval-0s)
              stop interval=0s timeout=120 (galera-stop-interval-0s)
[...]

이 출력에서는 간단한 번들과 달리 galera-bundle 리소스에는 다중 상태 리소스의 모든 측면을 결정하는 명시적 리소스 구성이 포함되어 있음을 보여줍니다.