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Add readiness check for docker container (#9804) 

* Update Dockerfile

Since parity is built for "mission critical use", I thought other operators may see the need for this.

Adding the `curl` and `jq` commands allows for an extremely simple health check to be usable in container orchestrators.

For example. Here is a health check for a parity docker container running in Kubernetes.

This can be setup as a readiness Probe that would prevent clustered nodes that aren't ready from serving traffic.

```bash
#!/bin/bash

ETH_SYNCING=$(curl -X POST --data '{"jsonrpc":"2.0","method":"eth_syncing","params":[],"id":1}' http://localhost:8545 -H 'Content-Type: application/json')
RESULT=$(echo "$ETH_SYNCING | jq -r .result)

if [ "$RESULT" == "false" ]; then
  echo "Parity is ready to start accepting traffic"
  exit 0
else
  echo "Parity is still syncing the blockchain"
  exit 1
fi
```

* add sync check script
This commit is contained in:
Azamat M 2018-10-26 05:51:08 -06:00 committed by Afri Schoedon
parent ff13c9c186
commit 9b55169251
2 changed files with 16 additions and 1 deletions
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4
scripts/docker/hub/Dockerfile
View File

@ -5,7 +5,7 @@ ARG TARGET
ENV TARGET ${TARGET}
# install tools and dependencies
RUN apt update && apt install -y --no-install-recommends openssl libudev-dev file
RUN apt update && apt install -y --no-install-recommends openssl libudev-dev file curl jq
# show backtraces
ENV RUST_BACKTRACE 1
@ -31,6 +31,8 @@ COPY artifacts/x86_64-unknown-linux-gnu/$TARGET ./bin/$TARGET
RUN echo "#!/bin/bash \n ${TARGET} \$@" > ./entrypoint.sh
RUN chmod +x ./entrypoint.sh
ADD check_sync.sh /check_sync.sh
# setup ENTRYPOINT
EXPOSE 5001 8080 8082 8083 8545 8546 8180 30303/tcp 30303/udp
ENTRYPOINT ["./entrypoint.sh"]

13
scripts/docker/hub/check_sync.sh Executable file
View File

@ -0,0 +1,13 @@
#!/bin/bash
# checks if parity has a fully synced blockchain
ETH_SYNCING=$(curl -X POST --data '{"jsonrpc":"2.0","method":"eth_syncing","params":[],"id":1}' http://localhost:8545 -H 'Content-Type: application/json')
RESULT=$(echo "$ETH_SYNCING" | jq -r .result)
if [ "$RESULT" == "false" ]; then
echo "Parity is ready to start accepting traffic"
exit 0
else
echo "Parity is still syncing the blockchain"
exit 1
fi