Docker运行Cassandra集群
- cassandra是一个开源的分布式NoSQL数据库系统。
- 去中心化而非Master/Slave架构，非常易于扩展。
- 面向列的数据库，不是传统结构式数据库。
获取镜像
docker pull cassandra:latest
创建单机容器
docker run -it --name cassandra cassandra:latest
挂载文件
切换到宿主机存放配置文件的地方(如果没有自己创建)
cd /opt/cassandra
首先我们从刚才单机版本中拷贝出yaml文件：cassandra.yaml
docker cp cassandra:/opt/cassandra/conf/cassandra.yaml .
查看拷贝出来的文件
ls
cassandra.yaml
修改配置文件：
authenticator: AllowAllAuthenticator 修改为 authenticator: PasswordAuthenticator来允许外部连接
删除容器,一定要删除，否则报错端口占用：
docker rm -f cassandra
编写docker-compose.yml文件
前提是你已经安装好了这里的docker-compose插件，另外具体的挂载位置一定根据自身来
version: '3'
services:cassandra-1:image: cassandra:latestcontainer_name: cassandra-1volumes:- ~/Desktop/brainwave/conf/cassandra/cassandra.yaml:/opt/cassandra/conf/cassandra.yaml- ~/Desktop/brainwave/data/cassandra-cluster/cassandra-1/cassandra:/var/lib/cassandraenvironment:- CASSANDRA_BROADCAST_ADDRESS=cassandra-1ports:- "7000:7000"- "9042:9042"restart: alwayscassandra-2:image: cassandra:latestcontainer_name: cassandra-2volumes:- ~/Desktop/brainwave/conf/cassandra/cassandra.yaml:/opt/cassandra/conf/cassandra.yaml- ~/Desktop/brainwave/data/cassandra-cluster/cassandra-2/cassandra:/var/lib/cassandraenvironment:- CASSANDRA_BROADCAST_ADDRESS=cassandra-2- CASSANDRA_SEEDS=cassandra-1ports:- "7001:7000"- "9043:9042"depends_on:- cassandra-1restart: alwayscassandra-3:image: cassandra:latestcontainer_name: cassandra-3volumes:- ~/Desktop/brainwave/conf/cassandra/cassandra.yaml:/opt/cassandra/conf/cassandra.yaml- ~/Desktop/brainwave/data/cassandra-cluster/cassandra-3/cassandra:/var/lib/cassandraenvironment:- CASSANDRA_BROADCAST_ADDRESS=cassandra-3- CASSANDRA_SEEDS=cassandra-1ports:- "7002:7000"- "9044:9042"depends_on:- cassandra-2restart: always
可能需要额外调整系统参数：
vi /etc/sysctl.conf
vm.max_map_count=1048575
sysctl -p