问题描述
我有一个K8s部署,其中一个吊舱运行着一个带有Envoy sw的容器.我以这样的方式定义了映像:如果定义了环境变量EXTRA_OPTS,它将被附加到命令行以启动Envoy.我想使用该变量来覆盖默认配置,如 https://www.envoyproxy.io/docs/特使/最新/操作/cli#cmdoption-config-yaml
I have a K8s deployment with one pod running among others a container with Envoy sw. I have defined image in such way that if there is an Environment variable EXTRA_OPTS defined it will be appended to the command line to start Envoy.I want to use that variable to override default configuration as explained inhttps://www.envoyproxy.io/docs/envoy/latest/operations/cli#cmdoption-config-yaml
对于其他命令选项,例如"-l debug",环境变量也可以正常工作.另外,我已经测试了预期的最终命令行,并且可以正常工作.
Environment variable works ok for other command options such as "-l debug" for example.Also, I have tested expected final command line and it works.
Dockerfile将Envoy设置为以这种方式运行:
Dockerfile set Envoy to run in this way:
CMD ["/bin/bash", "-c", "envoy -c envoy.yaml $EXTRA_OPTS"]
我要设置的是:
...
- image: envoy-proxy:1.10.0
imagePullPolicy: IfNotPresent
name: envoy-proxy
env:
- name: EXTRA_OPTS
value: ' --config-yaml "admin: { address: { socket_address: { address: 0.0.0.0, port_value: 9902 } } }"'
...
我已经使用最终命令行成功测试了运行特使:
I have succesfully tested running envoy with final command line:
envoy -c /etc/envoy/envoy.yaml --config-yaml "admin: { address: { socket_address: { address: 0.0.0.0, port_value: 9902 } } }"
我还测试了EXTRA_OPTS中的简单"选项,它的工作原理是:
And I have also tested a "simpler" option in EXTRA_OPTS and it works:
...
- image: envoy-proxy:1.10.0
imagePullPolicy: IfNotPresent
name: envoy-proxy
env:
- name: EXTRA_OPTS
value: ' -l debug'
...
我希望Envoy使用此新的管理端口运行,而不是出现参数错误:
I would expect Envoy running with this new admin port, instead I'm having param errors:
PARSE ERROR: Argument: {
Couldn't find match for argument
似乎引号没有传递到容器中的实际Environment变量...
It looks like quotes are not being passed to the actual Environment variable into the container...
有任何线索吗???
感谢所有人
推荐答案
您应该在dockerfile中将["/bin/bash", "-c", "envoy -c envoy.yaml"]
设置为ENTRYPOINT,或者在kubernetes中使用command
,然后使用args
添加其他参数.
You should set ["/bin/bash", "-c", "envoy -c envoy.yaml"]
as an ENTRYPOINT in you dockerfile or use command
in kubernetes and then use args
to add additional arguments.
您可以在 docker文档中找到更多信息.
You can find more information in docker documentation
让我通过示例进行解释:
Let me explain by example:
$ docker build -t fl3sh/test:bash .
$ cat Dockerfile
FROM ubuntu
RUN echo '#!/bin/bash' > args.sh && \
echo 'echo "$@"' >> args.sh && \
chmod -x args.sh
CMD ["args","from","docker","cmd"]
ENTRYPOINT ["/bin/bash", "args.sh", "$ENV_ARG"]
cat args.yaml
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: null
labels:
run: args
name: args
spec:
containers:
- args:
- args
- from
- k8s
image: fl3sh/test:bash
name: args
imagePullPolicy: Always
resources: {}
dnsPolicy: ClusterFirst
restartPolicy: Never
status: {}
Output:
pod/args $ENV_ARG args from k8s
cat command-args.yaml
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: null
labels:
run: command-args
name: command-args
spec:
containers:
- command:
- /bin/bash
- -c
args:
- 'echo args'
image: fl3sh/test:bash
imagePullPolicy: Always
name: args
resources: {}
dnsPolicy: ClusterFirst
restartPolicy: Never
status: {}
Output:
pod/command-args args
cat command-env-args.yaml
apiVersion: v1
kind: Pod
metadata:
labels:
run: command-env-args
name: command-env-args
spec:
containers:
- env:
- name: ENV_ARG
value: "arg from env"
command:
- /bin/bash
- -c
- exec echo "$ENV_ARG"
image: fl3sh/test:bash
imagePullPolicy: Always
name: args
resources: {}
dnsPolicy: ClusterFirst
restartPolicy: Never
status: {}
Output:
pod/command-env-args arg from env
cat command-no-args.yaml
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: null
labels:
run: command-no-args
name: command-no-args
spec:
containers:
- command:
- /bin/bash
- -c
- 'echo "no args";echo "$@"'
image: fl3sh/test:bash
name: args
imagePullPolicy: Always
resources: {}
dnsPolicy: ClusterFirst
restartPolicy: Never
status: {}
Output:
pod/command-no-args no args
#notice ^ empty line above
cat no-args.yaml
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: null
labels:
run: no-args
name: no-args
spec:
containers:
- image: fl3sh/test:bash
name: no-args
imagePullPolicy: Always
resources: {}
dnsPolicy: ClusterFirst
restartPolicy: Never
status: {}
Output:
pod/no-args $ENV_ARG args from docker cmd
如果您需要重新创建我的示例,则可以使用此循环获取上述输出:
If you need to recreate my example you can use this loop to get this output like above:
for p in `kubectl get po -oname`; do echo cat ${p#*/}.yaml; echo ""; \
cat ${p#*/}.yaml; echo -e "\nOutput:"; printf "$p "; \
kubectl logs $p;echo "";done
结论,如果需要将env作为参数传递,请使用:
Conclusion if you need to pass env as arguments use:
command:
- /bin/bash
- -c
- exec echo "$ENV_ARG"
我希望现在清楚了.
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