TeamCity docker-compose (Docker in Docker)

agent-wget-install.sh

docker exec teamcity_agent1 /bin/sh -c 'apt-get update && apt-get install -y wget docker-compose unzip'
docker exec teamcity_agent2 /bin/sh -c 'apt-get update && apt-get install -y wget docker-compose unzip'
docker exec teamcity_agent3 /bin/sh -c 'apt-get update && apt-get install -y wget docker-compose unzip'

docker-compose.yml

version: "3"
services:
  server:
    image: jetbrains/teamcity-server
    ports:
      - "8111:8111"
    volumes:
      - ./data_dir:/data/teamcity_server/datadir
      - ./log_dir:/opt/teamcity/logs
  teamcity-agent1:
    container_name: teamcity_agent1
    image: jetbrains/teamcity-agent
    environment:
      - SERVER_URL=server:8111
      - AGENT_NAME=agent1
      - DOCKER_IN_DOCKER=start
    privileged: true
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
  teamcity-agent2:
    container_name: teamcity_agent2
    image: jetbrains/teamcity-agent
    environment:
      - SERVER_URL=server:8111
      - AGENT_NAME=agent2
      - DOCKER_IN_DOCKER=start
    privileged: true
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
  teamcity-agent3:
    container_name: teamcity_agent3
    image: jetbrains/teamcity-agent
    privileged: true
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    environment:
      - SERVER_URL=server:8111
      - AGENT_NAME=agent3
      - DOCKER_IN_DOCKER=start
  db:
    image: mysql:5.7
    container_name: teamcity_db
    restart: on-failure
    environment:
      - MYSQL_ROOT_PASSWORD=teamcity
      - MYSQL_USER=teamcity
      - MYSQL_PASSWORD=teamcity
      - MYSQL_DATABASE=teamcity
    volumes:
      - ./mysql:/var/lib/mysql

docker exec teamcity_agent1 /bin/sh -c 'apt-get update && apt-get install -y wget docker-compose unzip'
docker exec teamcity_agent2 /bin/sh -c 'apt-get update && apt-get install -y wget docker-compose unzip'
docker exec teamcity_agent3 /bin/sh -c 'apt-get update && apt-get install -y wget docker-compose unzip'

Thanks, I fixed this.