docker-compose.yml中指定网段

在docker-compose.yml中修改默认网段，示例配置如下：

version: '3'
services:
  cassandra-7000:
    image: cassandra:3.11.6
    container_name: cassandra-7000
    volumes:
      - /ssddata/workspace/data/cassandra/7000:/var/lib/cassandra
    environment:
      - CASSANDRA_BROADCAST_ADDRESS=10.248.33.118
    ports:
      - "7000:7000"
      - "9042:9042"
    restart: always
  cassandra-7001:
    image: cassandra:3.11.6
    container_name: cassandra-7001
    volumes:
      -  /ssddata/workspace/data/cassandra/7001:/var/lib/cassandra
    environment:
      - CASSANDRA_BROADCAST_ADDRESS=10.248.33.118
      - CASSANDRA_SEEDS=10.248.33.113
    ports:
      - "7001:7000"
      - "9043:9042"
    depends_on:
      - cassandra-7000
    restart: always
    networks:
      extnetwork:
        ipv4_address: 192.168.255.2
networks:
  extnetwork:
    ipam:
      config:
      - subnet: 192.168.255.0/24