Ansible 使用 Here document (cat << EOF) 遇到的問題

這是在嘗試使用 Ansible 來輸出多行 config 時遇到的問題，實際例子可以參考在 CentOS 7 上安裝 Redis Replication (Redis 5) 其中要準備 redis.conf 的部份就有使用到 Here document (cat << EOF) 的技巧，原本想要延用相同方式在 Ansible 上執行，卻遇到問題，後來又再次在安裝 InfluxDB 時遇到相同狀況，所以快速筆記一下

基本環境說明

Azure 標準 B1ms (1 vcpu，2 GiB 記憶體)
Centos 7.7
ansible 2.7.8

ansible script

---
- name: Install Influxdb
  gather_facts: false
  vars:
  hosts: influxdb
  tasks:
    - name: Add repo
      shell: |
        cat <<EOF | sudo tee /etc/yum.repos.d/influxdb.repo
        [influxdb]
        name = InfluxDB Repository - RHEL \$releasever
        baseurl = https://repos.influxdata.com/rhel/\$releasever/\$basearch/stable
        enabled = 1
        gpgcheck = 1
        gpgkey = https://repos.influxdata.com/influxdb.key
        EOF

錯誤訊息

訊息內容

The full traceback is:
WARNING: The below traceback may *not* be related to the actual failure.
  File "/tmp/ansible_yum_payload_itApQ9/__main__.py", line 1437, in ensure
    current_repos = my.repos.repos.keys()
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 1071, in <lambda>
    repos = property(fget=lambda self: self._getRepos(),
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 694, in _getRepos
    self.getReposFromConfig()
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 567, in     getReposFromConfig
    self.getReposFromConfigFile(repofn, repo_age=thisrepo_age)
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 465, in     getReposFromConfigFile
    raise Errors.ConfigError(exception2msg(e))
    
fatal: [influx1]: FAILED! => {
    "ansible_facts": {
        "pkg_mgr": "yum"
    }, 
    "changed": false, 
    "invocation": {
        "module_args": {
            "allow_downgrade": false, 
            "autoremove": false, 
            "bugfix": false, 
            "conf_file": null, 
            "disable_excludes": null, 
            "disable_gpg_check": false, 
            "disable_plugin": [], 
            "disablerepo": [], 
            "download_only": false, 
            "enable_plugin": [], 
            "enablerepo": [], 
            "exclude": [], 
            "install_repoquery": true, 
            "installroot": "/", 
            "list": null, 
            "name": [
                "influxdb"
            ], 
            "releasever": null, 
            "security": false, 
            "skip_broken": false, 
            "state": "latest", 
            "update_cache": false, 
            "update_only": false, 
            "use_backend": "auto", 
            "validate_certs": true
        }
    },
    "msg": "Error accessing repos: File contains parsing errors: file:///etc/yum.repos.d/    influxdb.repo\n\t[line  2]:  name = InfluxDB Repository - RHEL 7\n\n\t[line  3]:      baseurl = https://repos.influxdata.com/rhel/7/x86_64/stable\n\n\t[line  4]:  enabled     = 1\n\n\t[line  5]:  gpgcheck = 1\n\n\t[line  6]:  gpgkey = https://repos.influxdata.    com/influxdb.key\n\n\t[line  7]:  EOF\n"
}

錯誤截圖

解決方式

多隔一層 cmd 指令

---
- name: Install Influxdb
  gather_facts: false
  hosts: influxdb
  tasks:
    - name: Add repo
      shell:
        cmd: |
          cat <<EOF | sudo tee /etc/yum.repos.d/influxdb.repo
          [influxdb]
          name = InfluxDB Repository - RHEL \$releasever
          baseurl = https://repos.influxdata.com/rhel/\$releasever/\$basearch/stable
          enabled = 1
          gpgcheck = 1
          gpgkey = https://repos.influxdata.com/influxdb.key
          EOF

心得

我覺這問題 Ansible 給出的錯誤訊息不好理解問題發生原因，造成透過錯誤訊息來 google 時比較發散，不過反過來透過語法來找資料就馬上得到答案了

至於問題發生原因，我沒有細究，畢竟這是工具的語法特性，以我目前的水準只求會用、可以解決問題就很滿足了，等到有需要了解語法背後含義的那天再來細看囉

文章目錄

Ansible 使用 Here document (cat << EOF) 遇到的問題

基本環境說明

錯誤訊息

解決方式

心得

參考資訊