docker compose部署cassandra集群的操作代码

docker compose 配置

假设有两台电脑

A电脑的ip为192.168.1.100

B电脑的ip为192.168.1.103

A电脑的docker compose 配置version: 3 services: cassandra: restart: always image: cassandra:3.11.10 hostname: cassandra1 container_name: cassandra-node-1 environment: – CASSANDRA_BROADCAST_ADDRESS=cassandra1 – CASSANDRA_SEEDS=cassandra1,cassandra3 extra_hosts: – “cassandra1:192.168.1.100” – “cassandra3:192.168.1.103” ports: – “9042:9042” – “7000:7000” volumes: – cassandra_data:/var/lib/cassandra volumes: cassandra_data:

B电脑的docker compose 配置

version: 3 services: cassandra: restart: always image: cassandra:3.11.10 hostname: cassandra3 container_name: cassandra-node-3 environment: – CASSANDRA_BROADCAST_ADDRESS=cassandra3 – CASSANDRA_SEEDS=cassandra1,cassandra3 extra_hosts: – “cassandra1:192.168.1.100” – “cassandra3:192.168.1.103” ports: – “9042:9042” – “7000:7000” volumes: – cassandra_data:/var/lib/cassandra volumes: cassandra_data:

设置内存

临时

sysctl -w vm.max_map_count=262144

永久

Disable memory paging and swapping performance on the host to improve performance.

禁用主机上的内存分页和交换性能以提高性能。

ps：这个看情况，内存大的话，也可以关掉 sudo swapoff -a

Increase the number of memory maps available to OpenSearch.

增加OpenSearch可用的内存映射数量。# Edit the sysctl config file sudo vi /etc/sysctl.conf # Add a line to define the desired value # or change the value if the key exists, # and then save your changes. vm.max_map_count=262144 # Reload the kernel parameters using sysctl sudo sysctl -p # Verify that the change was applied by checking the value cat /proc/sys/vm/max_map_count

两边同时启动

docker compose up -d

查看集群状态

#在A机器pingB机器 docker exec -ti cassandra-node-1 cqlsh -u cassandra -pcassandra cassandra3 -e “DESCRIBE CLUSTER”

返回

Cluster: Test Cluster Partitioner: Murmur3Partitioner

连接成功，可以使用数据库连接工具插入一条数据，分别连入A和B的数据库，查看数据是否一致