A command-wrapper that polls Linkerd for readiness until it becomes ready and only then executes a command.
linkerd-await 0.2.7
Wait for linkerd to become ready before running a program
USAGE:
linkerd-await [OPTIONS] [ARGS]
ARGS:
<CMD> The command to run after linkerd is ready
<ARGS>... Arguments to pass to CMD if specified
OPTIONS:
-b, --backoff <BACKOFF> Time to wait after a failed readiness check [default: 1s]
-h, --help Print help information
-p, --port <PORT> The port of the local Linkerd proxy admin server [default: 4191]
-S, --shutdown Forks the program and triggers proxy shutdown on completion
-t, --timeout <TIMEOUT> Causes linked-await to fail when the timeout elapses before the proxy
becomes ready
-v, --verbose Causes linkerd-await to print an error message when disabled [env:
LINKERD_AWAIT_VERBOSE=]
-V, --version Print version information
# Create a base layer with linkerd-await from a recent release.
FROM docker.io/curlimages/curl:latest as linkerd
ARG LINKERD_AWAIT_VERSION=v0.2.7
RUN curl -sSLo /tmp/linkerd-await https://github.com/linkerd/linkerd-await/releases/download/release%2F${LINKERD_AWAIT_VERSION}/linkerd-await-${LINKERD_AWAIT_VERSION}-amd64 && \
chmod 755 /tmp/linkerd-await
# Build your application with whatever environment makes sense.
FROM myapp-build as app
WORKDIR /app
RUN make build
# Package the application wrapped by linkerd-await. Note that the binary is
# static so it can be used in `scratch` images:
FROM scratch
COPY --from=linkerd /tmp/linkerd-await /linkerd-await
COPY --from=app /app/myapp /myapp
# In this case, we configure the proxy to be shutdown after `myapp` completes
# running. This is only really needed for jobs where the application is
# expected to complete on its own (namely, `Jobs` and `Cronjobs`)
ENTRYPOINT ["/linkerd-await", "--shutdown", "--"]
CMD ["/myapp"]The LINKERD_AWAIT_DISABLED (or LINKERD_DISABLED) environment variable can
be set to bypass linkerd-await's readiness checks. This way,
linkerd-await may be controlled by overriding a default environment
variable:
# ...
spec:
containers:
- name: myapp
env:
- name: LINKERD_AWAIT_DISABLED
value: "Linkerd is disabled ;("
# ...![dependabot[bot] avatar](https://avatars.githubusercontent.com/in/29110?v=4 "dependabot[bot]")
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