前言
通过Helm部署应用，修改configmap后，Deployment 副本控制器不会自动生效，需要手动删除pod 重建一下才会生效，
这里实践通过添加标签的方式在通过只修改configmap也能联动Deployment自动重建
安装应用
1
2
3
4
5
6
7
8
9
10
11
12
|
helm repo add bitnami https://charts.bitnami.com/bitnami
# 以grafana 应用部署为例 --untar 拉取下来后自动解压
helm pull bitnami/grafana --untar
# 这里做创建测试，关闭持久化，不创建pvc
helm install grafana ./grafana --set persistence.enabled=false
$ helm list
NAME NAMESPACE REVISION UPDATED STATUS CHART APP VERSION
grafana default 4 2024-07-21 15:28:58.208948145 +0800 CST deployed grafana-11.3.26 11.3.0
$ kubectl get pod
NAME READY STATUS RESTARTS AGE
grafana-6cc56576dc-97bvw 1/1 Running 0 138m
|
验证
1、修改配置
1
|
vim grafana/templates/deployment.yaml
|
2、添加label
1
2
3
|
labels: {{- include "common.labels.standard" ( dict "customLabels" .Values.commonLabels "context" $ ) | nindent 4 }}
app.kubernetes.io/component: grafana
configmap-hash: "{{ .Values.config | toYaml | sha256sum | trunc 63 }}" # 添加configmap-hash
|
3、修改configmap
1
|
vim grafana/templates/configmap.yaml
|
data 内容添加一行测试数据GF_TEST: /opt/test
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
root@k8s-master01:~/helm# kubectl get cm grafana-envvars -o yaml
apiVersion: v1
data:
GF_AUTH_LDAP_ALLOW_SIGN_UP: "false"
GF_AUTH_LDAP_CONFIG_FILE: /opt/bitnami/grafana/conf/ldap.toml
GF_AUTH_LDAP_ENABLED: "false"
GF_INSTALL_PLUGINS: ""
GF_PATHS_CONFIG: /opt/bitnami/grafana/conf/grafana.ini
GF_PATHS_DATA: /opt/bitnami/grafana/data
GF_PATHS_LOGS: /opt/bitnami/grafana/logs
GF_PATHS_PLUGINS: /opt/bitnami/grafana/data/plugins
GF_PATHS_PROVISIONING: /opt/bitnami/grafana/conf/provisioning
GF_SECURITY_ADMIN_USER: admin
GF_TEST: /opt/test
|
4、升级
1
2
3
4
5
6
|
$ helm upgrade grafana ./grafana --set persistence.enabled=false
# 可以看到容器发生了重建
$ kubectl get pod
NAME READY STATUS RESTARTS AGE
grafana-6cc56576dc-97bvw 1/1 Running 0 145m
grafana-7b8869fd4f-6jrd5 0/1 Running 0 4s
|
总结
Helm借助添加标签hash化，动态更新deployment
Less is more