apiVersion: v1
kind: ConfigMap
metadata:
name: java-demo-config
data:
application.yml: |
server:
port: 8080
spring:
datasource:
url: jdbc:mysql://localhost:3306/test?characterEncoding=utf-8
username: root
password: 123456789
driver-class-name: com.mysql.jdbc.Driver
freemarker:
allow-request-override: false
cache: true
check-template-location: true
charset: UTF-8
content-type: text/html; charset=utf-8
expose-request-attributes: false
expose-session-attributes: false
expose-spring-macro-helpers: false
suffix: .ftl
template-loader-path:
- classpath:/templates/
挂载注意了：
如果挂载空目录没事，如果挂载了已有文件的目录到容器的目录，那么容器目录里面的文件都会被覆盖，解决办法是使用subpath指定其子路径。你将configmap挂载在指定的目录下，指定的目录是有文件的，你挂载之后只剩下挂载的文件，其余文件没有了，可以使用subpath指定文件名字解决这个问题
[root@k8s-master ~]# cat deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: java-demo
spec:
replicas: 1
selector:
matchLabels:
project: www
app: java-demo
template:
metadata:
labels:
project: www
app: java-demo
spec:
imagePullSecrets:
- name: registry-auth
containers:
- image: reg.ctnrs.com/demo/java-demo:v1
name: java-demo
volumeMounts:
- name: config
mountPath: "/usr/local/tomcat/webapps/ROOT/WEB-INF/classes/application.yml"
subPath: application.yml
resources:
requests:
cpu: 0.5
memory: 500Mi
limits:
cpu: 1
memory: 1Gi
livenessProbe:
httpGet:
path: /
port: 8080
initialDelaySeconds: 80
periodSeconds: 10
readinessProbe:
httpGet:
path: /
port: 8080
initialDelaySeconds: 80
periodSeconds: 10
volumes:
- name: config
configMap:
name: java-demo-config
items:
- key: "application.yml"
path: "application.yml"
现在要将配置挂载在容器
- key: "application.yml" 这个指的是在configmap定义的下面
data:
application.yml: |
path: "application.yml" 具体是挂载在容器目录当中具体的文件名
一般上面两个保持一致
ConfigMap挂载导致容器目录覆盖的问题解决
问题表现：
将configmap的配置项挂载到指定的容器目录中，导致容器的被挂载目录下的所有文件不可见，只可见通过configmap挂载的文件
解决办法：
- volumes中设置path
- volumeMounts中这是subPath
ConfigMap
[root@k8s-master ~]# cat configmap.yml
apiVersion: v1
kind: ConfigMap
metadata:
name: configmaptest
namespace: default
data:
configmap: test
cni-conf.json: |
{
"name": "cbr0",
"cniVersion": "0.3.1",
"plugins": [
{
"type": "flannel",
"delegate": {
"hairpinMode": true,
"isDefaultGateway": true
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
net-conf.json: |
{
"Network": "10.244.0.0/16",
"Backend": {
"Type": "vxlan"
}
}
[root@k8s-master ~]# kubectl get cm
NAME DATA AGE
smartcity-frontend-config 2 48m
[root@k8s-master ~]# kubectl describe cm smartcity-frontend-config
Name: smartcity-frontend-config
Namespace: default
Labels: <none>
Annotations: <none>
Data
====
config-js:
----
{
"name": "cbr0",
"cniVersion": "0.3.1",
"plugins": [
{
"type": "flannel",
"delegate": {
"hairpinMode": true,
"isDefaultGateway": true
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
log4j-js-json:
----
{
"Network": "10.244.0.0/16",
"Backend": {
"Type": "vxlan"
}
}
Events: <none>
Deployment（正确挂载方式）
[root@k8s-master ~]# cat deployment.yml
apiVersion: apps/v1
kind: Deployment
metadata:
name: pod-readiness
namespace: default
spec:
replicas: 3
selector:
matchLabels:
app: readiness
template:
metadata:
labels:
app: readiness
spec:
containers:
- name: busybox
image: busybox
command: ['sh','-c','sleep 3600']
volumeMounts:
- name: smartcity-frontend-config
mountPath: /var/config.js
subPath: config-js
- name: smartcity-frontend-config
mountPath: /var/log4js.json
subPath: log4j-js-json
volumes:
- name: smartcity-frontend-config
configMap:
name: smartcity-frontend-config
items:
- key: log4j-js-json
path: log4j-js-json
- key: config-js
path: config-js
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
pod-readiness-bdc6f8c88-7w9rw 1/1 Running 0 13m
pod-readiness-bdc6f8c88-9cpk4 1/1 Running 0 13m
pod-readiness-bdc6f8c88-rkl7x 1/1 Running 0 13m
[root@k8s-master ~]# kubectl exec -it pod-readiness-bdc6f8c88-7w9rw -- sh
/ # ls /var
config.js log4js.json run spool www
/ # cat /var/config.js
{
"name": "cbr0",
"cniVersion": "0.3.1",
"plugins": [
{
"type": "flannel",
"delegate": {
"hairpinMode": true,
"isDefaultGateway": true
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
/ #
总结一下模板
ConfigMap
apiVersion: v1
kind: ConfigMap
metadata:
name: smartcity-frontend-config
namespace: portal-frontend
data:
config-js: | xxxx自定义文件内容
log4j-js-json: | xxxx自定义文件内容
Deployment（正确挂载方式）
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: smartcity-frontend
namespace: portal-frontend
spec:
replicas: 2
selector:
matchLabels:
app: smartcity-frontend
template:
metadata:
labels:
app: smartcity-frontend
spec:
containers:
- name: node
image: hub.cloud.pub/frontend/node:2.12.4
imagePullPolicy: Always
ports:
- containerPort: 8080
volumeMounts:
- name: smartcity-frontend-config
mountPath: /opt/frontend/config.js
subPath: path/to/config.js
- name: smartcity-frontend-config
mountPath: /opt/frontend/log4js.json
subPath: path/to/log4js.json
volumes:
- name: smartcity-frontend-config
configMap:
name: smartcity-frontend-config
items:
- key: config-js
path: path/to/config.js
- key: log4j-js-json
path: path/to/log4js.json
例如nginx
apiVersion: v1
kind: ConfigMap
metadata:
name: nginxconfig
namespace: mt-math
data:
nginx.conf: |
#########wyl530
user nginx;
worker_processes auto;
error_log /etc/nginx/error.log;
pid /run/nginx.pid;
include /usr/share/nginx/modules/*.conf;
events {
worker_connections 1024;
}
http {
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
server_tokens off;
access_log /usr/share/nginx/html/access.log main;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
include /etc/nginx/mime.types;
default_type application/octet-stream;
include /etc/nginx/conf.d/*.conf;
server {
listen 80 default_server;
listen [::]:80 default_server;
server_name _;
root /usr/share/nginx/html;
include /etc/nginx/default.d/*.conf;
location / {
}
error_page 404 /404.html;
location = /40x.html {
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
}
}
}
volumeMounts:
- name: nginx-nfs
mountPath: /usr/share/nginx/html
- name: nginx-pvc
mountPath: /var/log/nginx
subPath: nginx.conf
- name: nginx-etc #挂载数据节点名称
mountPath: /etc/nginx/nginx.conf #挂载此目录
subPath: nginx.conf
volumes: #设置挂载
- name: nginx-nfs #挂载的数据节点名称
nfs: #挂载的服务类型
server: 192.168.0.14 #服务Ip
path: /NFS/wwwroot #挂载数据目录
- name: nginx-pvc #挂载数据节点名称
persistentVolumeClaim: #服务类型
claimName: nfs-data-pvc #数据源名称
- name: nginx-etc #挂载数据节点名称
configMap:
name: nginxconfig #指定创建configMap的名称
items:
- key: nginx.conf #key为文件名称
path: nginx.conf #文件路径内容
