使用 Kubectl 进行故障排除

本文档描述了如何使用 kubectl 来调试集群的任何问题。

深入了解组件

使用 kubectl，可以检查集群的当前状态。当使用 helm 安装 Workflow 时，Workflow 被安装到 drycc 命名空间中。要检查 Workflow 是否正在运行，请运行：

$ kubectl --namespace=drycc get pods
NAME                          READY     STATUS              RESTARTS   AGE
drycc-builder-gqum7            0/1       ContainerCreating   0          4s
drycc-controller-h6lk6         0/1       ContainerCreating   0          4s
drycc-controller-celery-cmxxn  0/3       ContainerCreating   0          4s
drycc-database-56v39           0/1       ContainerCreating   0          4s
drycc-fluentbit-xihr1          0/1       Pending             0          2s
drycc-storage-c2exb            0/1       Pending             0          3s
drycc-grafana-9ccur            0/1       Pending             0          3s
drycc-registry-5bor6           0/1       Pending             0          3s

要获取特定组件的日志，请使用 kubectl logs：

$ kubectl --namespace=drycc logs drycc-controller-h6lk6
system information:
Django Version: 1.9.6
Python 3.5.1
addgroup: gid '0' in use
Django checks:
System check identified no issues (2 silenced).
[...]

要深入运行中的容器来检查其环境，请使用 kubectl exec：

$ kubectl --namespace=drycc exec -it drycc-database-56v39 gosu postgres psql
psql (13.4 (Debian 13.4-1.pgdg100+1))
Type "help" for help.

postgres=# \l
                                                List of databases
     Name          |  Owner   | Encoding |  Collate   |   Ctype    |   Access privileges
-------------------+----------+----------+------------+------------+-----------------------
 drycc_controller  | postgres | UTF8     | en_US.utf8 | en_US.utf8 |
 drycc_passport    | postgres | UTF8     | en_US.utf8 | en_US.utf8 |
 postgres          | postgres | UTF8     | en_US.utf8 | en_US.utf8 |
 template0         | postgres | UTF8     | en_US.utf8 | en_US.utf8 | =c/postgres          +
                   |          |          |            |            | postgres=CTc/postgres
 template1         | postgres | UTF8     | en_US.utf8 | en_US.utf8 | =c/postgres          +
                   |          |          |            |            | postgres=CTc/postgres
(4 rows)
postgres=# \connect drycc_controller
You are now connected to database "drycc_controller" as user "postgres".
drycc_controller=# \dt
                                 List of relations
 Schema |              Name              | Type  |      Owner
--------+--------------------------------+-------+-------------------
 public | api_app                        | table | drycc_controller
 public | api_build                      | table | drycc_controller
 public | api_certificate                | table | drycc_controller
 public | api_config                     | table | drycc_controller
 public | api_domain                     | table | drycc_controller
 public | api_key                        | table | drycc_controller
 public | api_push                       | table | drycc_controller
 public | api_release                    | table | drycc_controller
 public | auth_group                     | table | drycc_controller
 --More--
 drycc_controller=# SELECT COUNT(*) from api_app;
 count
-------
     0
(1 row)