[K8S] 使用yaml文件创建deployment踩坑(新手的小坑)

「爱情、让人受尽委屈。」 2022-09-01 09:21 758阅读 0赞

虽然用过、修改过现成的yaml文件，但这个东西一次没纯手打真的不行！以下是一个非常简单且漏洞百出的yaml文件|||

# WRONG example version 1
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: nginx1
      namespace:default
    spec:
      replicas: 3
      selector:
        matchLabels:
              app: nginx2
    template:
      metadata:
        labels:
              app: nginx2
      spec:
        containers:
              - name: nginx3
                image: nginx

**Round1** 第一次执行报了这么个错

![20210727200019311.png][]

\[root@k8s-master ~\]\# kubectl apply -f deploymentNginx.yaml  
error: error parsing deploymentNginx.yaml: error converting YAML to JSON: yaml: line 7: could not find expected ':'  
\[root@k8s-master ~\]\#

那就看看第7行吧~ 第7行的冒号没什么问题，但是上面一行的冒号后少了个空格

冒号后如果有值，冒号后得有个空格

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d5X2hoeHg_size_16_color_FFFFFF_t_70][]

**Round2** 修改后执行执行依旧报错

![20210727200102223.png][]

\[root@k8s-master ~\]\# kubectl apply -f deploymentNginx.yaml  
error: error parsing deploymentNginx.yaml: error converting YAML to JSON: yaml: line 11: found character that cannot start any token  
\[root@k8s-master ~\]\#

用vim +11 deploymentNginx.yaml并没有看出什么问题，用cat -A看看有没有特殊字符

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d5X2hoeHg_size_16_color_FFFFFF_t_70 1][]

用Notepad++编辑后丢上Linux环境的。。复现了一下，虽然注意使用空格，但是回车的时候出现了一个Tab键

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d5X2hoeHg_size_16_color_FFFFFF_t_70 2][]

不能有Tab键！

尽量使用Unix格式吧，然后Notepad++的Tab键可以设置一下，设置-> 首选项-> 语言

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d5X2hoeHg_size_16_color_FFFFFF_t_70 3][]

**Round3** 在Linux环境编辑后执行又又又报错

![20210727202429732.png][]

\[root@k8s-master ~\]\# kubectl apply -f deploymentNginx.yaml  
error: error validating "deploymentNginx.yaml": error validating data: \[ValidationError(Deployment.spec): missing required field "template" in io.k8s.api.apps.v1.DeploymentSpec, ValidationError(Deployment): unknown field "template" in io.k8s.api.apps.v1.Deployment\]; if you choose to ignore these errors, turn validation off with --validate=false  
\[root@k8s-master ~\]\#

仔细看看，template这个块的缩进不对

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d5X2hoeHg_size_16_color_FFFFFF_t_70 4][]

缩进要正确！

再执行一次，终于对了

apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: nginx1
      namespace: default
    spec:
      replicas: 3
      selector:
        matchLabels:
              app: nginx2
      template:
        metadata:
          labels:
            app: nginx2
        spec:
          containers:
            - name: nginx3
              image: nginx

nginx123之所以写成不一样是为了起来之后方便观察对应关系，注意nginx2的两个地方的标签要一致，使用 kubectl get deployment -o wide 查看![2021072720305955.png][]

[20210727200019311.png]: /images/20220829/6c36618e719544f0bf28b9355b149ce2.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d5X2hoeHg_size_16_color_FFFFFF_t_70]: /images/20220829/24985d642f9a4b81bcf6557d8b4bc0ce.png
[20210727200102223.png]: /images/20220829/c62b8bc3dcbc46b2934c0e92ba689652.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d5X2hoeHg_size_16_color_FFFFFF_t_70 1]: /images/20220829/ddb3dddc56e7473aa3cfb85bf16309b9.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d5X2hoeHg_size_16_color_FFFFFF_t_70 2]: /images/20220829/cbc65b633bed42eb9b38c3d1fce24bb0.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d5X2hoeHg_size_16_color_FFFFFF_t_70 3]: /images/20220829/4f429948203c428ab36ee29942d58829.png
[20210727202429732.png]: /images/20220829/b56fbe7e572248dc9dbd86914c1fee81.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d5X2hoeHg_size_16_color_FFFFFF_t_70 4]: /images/20220829/b20c7f572c464a0e962d3e698aae66cc.png
[2021072720305955.png]: /images/20220829/421620b4555b49a893f87fac3021de28.png