Add etcd-events cluster for kube-apiserver (#2385)

Add etcd-events cluster for kube-apiserver

roles/etcd/templates/etcd-events-docker.service.j2

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+[Unit]
+Description=etcd docker wrapper
+Wants=docker.socket
+After=docker.service
+
+[Service]
+User=root
+PermissionsStartOnly=true
+EnvironmentFile=-/etc/etcd-events.env
+ExecStart={{ bin_dir }}/etcd-events
+ExecStartPre=-{{ docker_bin_dir }}/docker rm -f {{ etcd_member_name }}-events
+ExecStop={{ docker_bin_dir }}/docker stop {{ etcd_member_name }}-events
+Restart=always
+RestartSec=15s
+TimeoutStartSec=30s
+
+[Install]
+WantedBy=multi-user.target

roles/etcd/templates/etcd-events-host.service.j2

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+[Unit]
+Description=etcd
+After=network.target
+
+[Service]
+Type=notify
+User=root
+EnvironmentFile=/etc/etcd-events.env
+ExecStart={{ bin_dir }}/etcd
+NotifyAccess=all
+Restart=always
+RestartSec=10s
+LimitNOFILE=40000
+
+[Install]
+WantedBy=multi-user.target

roles/etcd/templates/etcd-events.env.j2

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+ETCD_DATA_DIR={{ etcd_events_data_dir }}
+ETCD_ADVERTISE_CLIENT_URLS={{ etcd_events_client_url }}
+ETCD_INITIAL_ADVERTISE_PEER_URLS={{ etcd_events_peer_url }}
+ETCD_INITIAL_CLUSTER_STATE={% if etcd_cluster_is_healthy.rc != 0 | bool %}new{% else %}existing{% endif %}
+
+ETCD_METRICS={{ etcd_metrics }}
+ETCD_LISTEN_CLIENT_URLS=https://{{ etcd_address }}:2381,https://127.0.0.1:2381
+ETCD_ELECTION_TIMEOUT={{ etcd_election_timeout }}
+ETCD_HEARTBEAT_INTERVAL={{ etcd_heartbeat_interval }}
+ETCD_INITIAL_CLUSTER_TOKEN=k8s_events_etcd
+ETCD_LISTEN_PEER_URLS=https://{{ etcd_address }}:2382
+ETCD_NAME={{ etcd_member_name }}-events
+ETCD_PROXY=off
+ETCD_INITIAL_CLUSTER={{ etcd_events_peer_addresses }}
+ETCD_AUTO_COMPACTION_RETENTION={{ etcd_compaction_retention }}
+
+# TLS settings
+ETCD_TRUSTED_CA_FILE={{ etcd_cert_dir }}/ca.pem
+ETCD_CERT_FILE={{ etcd_cert_dir }}/member-{{ inventory_hostname }}.pem
+ETCD_KEY_FILE={{ etcd_cert_dir }}/member-{{ inventory_hostname }}-key.pem
+ETCD_CLIENT_CERT_AUTH={{ etcd_secure_client | lower}}
+
+ETCD_PEER_TRUSTED_CA_FILE={{ etcd_cert_dir }}/ca.pem
+ETCD_PEER_CERT_FILE={{ etcd_cert_dir }}/member-{{ inventory_hostname }}.pem
+ETCD_PEER_KEY_FILE={{ etcd_cert_dir }}/member-{{ inventory_hostname }}-key.pem
+ETCD_PEER_CLIENT_CERT_AUTH={{ etcd_peer_client_auth }}

roles/etcd/templates/etcd-events.j2

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+#!/bin/bash
+{{ docker_bin_dir }}/docker run \
+  --restart=on-failure:5 \
+  --env-file=/etc/etcd-events.env \
+  --net=host \
+  -v /etc/ssl/certs:/etc/ssl/certs:ro \
+  -v {{ etcd_cert_dir }}:{{ etcd_cert_dir }}:ro \
+  -v {{ etcd_events_data_dir }}:{{ etcd_events_data_dir }}:rw \
+  {% if etcd_memory_limit is defined %}
+  --memory={{ etcd_memory_limit|regex_replace('Mi', 'M') }} \
+  {% endif %}
+  --oom-kill-disable \
+  {% if etcd_cpu_limit is defined %}
+  --cpu-shares={{ etcd_cpu_limit|regex_replace('m', '') }} \
+  {% endif %}
+  {% if etcd_blkio_weight is defined %}
+  --blkio-weight={{ etcd_blkio_weight }} \
+  {% endif %}
+  --name={{ etcd_member_name }}-events \
+  {{ etcd_image_repo }}:{{ etcd_image_tag }} \
+  /usr/local/bin/etcd \
+  "$@"