Ansible stable-2.12集成测试无法连接localhost问题求助

在GitHub工作流环境中，仅Ansible stable-2.12版本的集成测试出现localhost连接失败问题，错误信息如下：

fatal: [localhost]: UNREACHABLE! => {
    "changed": false,
    "msg": "Data could not be sent to remote host \"localhost\". Make sure this host can be reached over ssh: OpenSSH_7.6p1 Ubuntu-4ubuntu0.5, OpenSSL 1.0.2n  7 Dec 2017\r\ndebug1: Reading configuration data /etc/ssh/ssh_config\r\ndebug1: /etc/ssh/ssh_config line 19: Applying options for *\r\ndebug1: auto-mux: Trying existing master\r\ndebug1: Control socket \"/root/.ansible/cp/72dc686b8e\" does not exist\r\ndebug2: resolving \"localhost\" port 22\r\ndebug2: ssh_connect_direct: needpriv 0\r\ndebug1: Connecting to localhost [127.0.0.1] port 22.\r\ndebug2: fd 3 setting O_NONBLOCK\r\ndebug1: connect to address 127.0.0.1 port 22: Connection refused\r\ndebug1: Connecting to localhost [::1] port 22.\r\ndebug2: fd 3 setting O_NONBLOCK\r\ndebug1: connect to address ::1 port 22: Cannot assign requested address\r\nssh: connect to host localhost port 22: Cannot assign requested address\r\n",
    "unreachable": true
}

PLAY RECAP *********************************************************************
localhost                  : ok=0    changed=0    unreachable=1    failed=0    skipped=0    rescued=0    ignored=0   

Command exited with status 4 after 0.9616847038269043 seconds.
ERROR: Command "ansible-playbook -i /tmp/ssh-inventory-5veyhtvk.json /root/ansible/test/lib/ansible_test/_data/playbooks/posix_hosts_prepare.yml -e '{"hosts_entries": ["172.17.0.2 nios-simulator # ansible-test 92c84b72-be55-4d0c-8515-cf8d7fa1cd0c"]}' -vvvvvv" returned exit status 4.

解决方案 #

• 启动GitHub Runner的SSH服务
  GitHub默认Ubuntu runner未启用sshd，需在工作流步骤中先启动服务：

  sudo systemctl enable --now sshd
  

• 强制Ansible使用本地连接
  针对localhost，无需通过SSH连接，可在inventory或playbook中指定connection: local：

  • 修改inventory文件（如/tmp/ssh-inventory-5veyhtvk.json）：

    {
      "localhost": {
        "ansible_connection": "local"
      }
    }
    

  • 或在playbook中直接指定：

    - hosts: localhost
      connection: local
      tasks:
        # 任务内容
    

• 禁用SSH控制套接字
  在ansible.cfg中添加配置，避免控制套接字导致的连接问题：

  [ssh_connection]
  control_path = none
  

• 修复IPv6连接问题
  错误显示IPv6连接失败，可临时禁用IPv6或强制使用IPv4：

  # 禁用IPv6
  sudo sysctl -w net.ipv6.conf.all.disable_ipv6=1
  sudo sysctl -w net.ipv6.conf.default.disable_ipv6=1
  # 或强制Ansible使用IPv4连接localhost
  ansible-playbook ... -e ansible_host=127.0.0.1
  

• 适配Ansible stable-2.12环境依赖
  该版本可能存在兼容性问题，更新openssh-client确保环境正常：

  sudo apt-get update && sudo apt-get install -y openssh-client
  

内容的提问来源于stack exchange，提问作者Hemanth Kumar Kandamuri