我有几个Postgresql服务,以及一些对我而言有用的其他服务(用于创建HA Postgresql集群)。该集群在下面的docker-compose中进行了描述:
version: '3.3'
services:
haproxy:
image: haproxy:alpine
ports:
- "5000:5000"
- "5001:5001"
- "8008:8008"
configs:
- haproxy_cfg
networks:
- dbs
command: haproxy -f /haproxy_cfg
etcd:
image: quay.io/coreos/etcd:v3.1.2
configs:
- etcd_cfg
networks:
- dbs
command: /bin/sh /etcd_cfg
dbnode1:
image: seocahill/patroni:1.2.5
secrets:
- patroni.yml
environment:
- PATRONI_NAME=dbnode1
- PATRONI_POSTGRESQL_DATA_DIR=data/dbnode1
- PATRONI_POSTGRESQL_CONNECT_ADDRESS=dbnode1:5432
- PATRONI_RESTAPI_CONNECT_ADDRESS=dbnode1:8008
env_file:
- test.env
networks:
- dbs
entrypoint: patroni
command: /run/secrets/patroni.yml
dbnode2:
image: seocahill/patroni:1.2.5
secrets:
- patroni.yml
environment:
- PATRONI_NAME=dbnode2
- PATRONI_POSTGRESQL_DATA_DIR=data/dbnode2
- PATRONI_POSTGRESQL_CONNECT_ADDRESS=dbnode2:5432
- PATRONI_RESTAPI_CONNECT_ADDRESS=dbnode2:8008
env_file:
- test.env
networks:
- dbs
entrypoint: patroni
command: /run/secrets/patroni.yml
dbnode3:
image: seocahill/patroni:1.2.5
secrets:
- patroni.yml
environment:
- PATRONI_NAME=dbnode3
- PATRONI_POSTGRESQL_DATA_DIR=data/dbnode3
- PATRONI_POSTGRESQL_CONNECT_ADDRESS=dbnode3:5432
- PATRONI_RESTAPI_CONNECT_ADDRESS=dbnode3:8008
env_file:
- test.env
networks:
- dbs
entrypoint: patroni
command: /run/secrets/patroni.yml
networks:
dbs:
external: true
configs:
haproxy_cfg:
file: config/haproxy.cfg
etcd_cfg:
file: config/etcd.sh
secrets:
patroni.yml:
file: patroni.test.yml
我从https://github.com/seocahill/ha-postgres-docker-stack.git
中获取了这个yml代码。我使用下一个命令在docker swarm-docker network create -d overlay --attachable dbs && docker stack deploy -c docker-stack.test.yml test_pg_cluster
中部署此服务。但是,如果我创建一些数据库并向其中插入一些数据,然后重新启动服务,则我的数据将丢失。我知道我需要使用volume
在主机上保存数据。我使用docker命令创建卷:docker volume create pgdata
,使用默认的docker卷目录,并按以下方式安装它:
dbnode1:
image: seocahill/patroni:1.2.5
secrets:
- patroni.yml
environment:
- PATRONI_NAME=dbnode1
- PATRONI_POSTGRESQL_DATA_DIR=data/dbnode1
- PATRONI_POSTGRESQL_CONNECT_ADDRESS=dbnode1:5432
- PATRONI_RESTAPI_CONNECT_ADDRESS=dbnode1:8008
env_file:
- test.env
volumes:
pgdata:/data/dbnode1
networks:
- dbs
entrypoint: patroni
command: /run/secrets/patroni.yml
volumes:
pgdata:
容器启动时,它在容器内的数据目录data / dbnode1中具有自己的配置。而且,如果我在主机上装入用于存储数据的卷pgdata
,则无法连接到db,并且容器目录data / dbnode1中没有空文件夹。如何创建持久数据卷以在PostgerSQL中保存更改的数据?
通过直接添加路径来创建volumes
更容易。检查此示例。
dbnode1:
image: seocahill/patroni:1.2.5
secrets:
- patroni.yml
environment:
- PATRONI_NAME=dbnode1
- PATRONI_POSTGRESQL_DATA_DIR=data/dbnode1
- PATRONI_POSTGRESQL_CONNECT_ADDRESS=dbnode1:5432
- PATRONI_RESTAPI_CONNECT_ADDRESS=dbnode1:8008
env_file:
- test.env
volumes:
- /opt/dbnode1/:/data/dbnode1
networks:
- dbs
entrypoint: patroni
command: /run/secrets/patroni.yml
注意行
volumes:
- /opt/dbnode1/:/data/dbnode1
我正在使用路径/opt/dbnode1/
从容器将文件系统存储在/data/dbnode1
。
此外,请务必注意,docker swarm 不创建文件夹为您服务。因此,您必须在启动服务之前创建文件夹。运行mkdir -p /opt/dbnode1
。