# Dockerized JSON-API **URL:** \ **Category:** App Development\ **Tags:** json-api\ **Created:** [August 15, 2021, 9:20am UTC](https://forum.canton.network/t/dockerized-json-api/2996 "2021-08-15T09:20:48Z")\ **Posts on this page:** 15\ **Page:** 1
**Author:** ![kctam](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/kctam/32/1895_2.png) [@kctam](https://forum.canton.network/u/kctam)\ **Post date:** [August 15, 2021, 9:20am UTC](https://forum.canton.network/t/dockerized-json-api/2996/1 "2021-08-15T09:20:48Z")
Hi team, I am building a canton setup in Docker, and therefore wish to create container for json-api, instead of running it as a process. I use “openjdk:11” docker image, and inside the container, I run this command `java -jar http-json-1.15.0.jar --ledger-host --ledger-port 5011 --address 0.0.0.0 --http-port 7575 --allow-insecure-tokens`. It fails, as the json-api keep pinging the canton\_container\_name:5011. If I change the name to the actual IP (172.18.0.3) the json-api works well. So I assume my problem is due to the json-api unable to convert the container name into the IP. However, inside the “json-api” container I can ping canton\_container\_name which results the right IP (i.e. 172.18.0.3). Can anyone shed some light on anything wrong in this setting? Or do we have any suggestion in dockerized the json-api in general? Thanks in advance. kc ---
**Author:** ![stefanobaghino-da](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/stefanobaghino-da/32/7057_2.png) [@stefanobaghino-da](https://forum.canton.network/u/stefanobaghino-da)\ **Post date:** [August 16, 2021, 6:28am UTC](https://forum.canton.network/t/dockerized-json-api/2996/2 "2021-08-16T06:28:18Z")
I had a look at this error and I’m a bit surprised. It looks as if domain resolution follows different paths for `ping` and `java`. I’ll look into it. For the time being, the only way to get the full error spelled out is to let it run out of attempts (should take around 10 minutes, if you can let the process run in the background for that long). This is not very reasonable, but I just opened [a PR to make sure the error message is printed after every failed connection attempt](https://github.com/digital-asset/daml/pull/10581), so that in the future diagnosing connection errors should become a bit easier. ---
**Author:** ![stefanobaghino-da](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/stefanobaghino-da/32/7057_2.png) [@stefanobaghino-da](https://forum.canton.network/u/stefanobaghino-da)\ **Post date:** [August 16, 2021, 6:34am UTC](https://forum.canton.network/t/dockerized-json-api/2996/3 "2021-08-16T06:34:50Z")
I had a look at the [Docker networking documentation](https://docs.docker.com/config/containers/container-networking/#dns-services) but nothing there looks like there should be reasons why domain resolution works for `ping` but fails for `java`. ---
**Author:** ![cocreature](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/cocreature/32/36_2.png) [@cocreature](https://forum.canton.network/u/cocreature)\ **Post date:** [August 16, 2021, 6:38am UTC](https://forum.canton.network/t/dockerized-json-api/2996/4 "2021-08-16T06:38:32Z")
Docker has a bunch of different networking modes, which one are you using? I used a user-defined bridge network for the JSON API in the past and that allowed me to pass in container names to the JSON API. Also which docker container are you using? ---
**Author:** ![kctam](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/kctam/32/1895_2.png) [@kctam](https://forum.canton.network/u/kctam)\ **Post date:** [August 16, 2021, 7:58am UTC](https://forum.canton.network/t/dockerized-json-api/2996/5 "2021-08-16T07:58:26Z")
Hi @stefanobaghino-da , just wait for 10 minutes and here is the error message. ```haskell 16-08-2021 07:55:58.934 [timer-utils] INFO com.daml.http.LedgerClient$ - Attempting to connect to the ledger 98-alldocker_canton_1:5011 (attempt 599/600) 16-08-2021 07:55:59.935 [timer-utils] INFO com.daml.http.LedgerClient$ - Attempting to connect to the ledger 98-alldocker_canton_1:5011 (attempt 600/600) 16-08-2021 07:55:59.958 [http-json-ledger-api-akka.actor.default-dispatcher-7] ERROR com.daml.http.Main - Cannot start server: Error(Maximum initial connection retry attempts(600) reached, Cannot connect to ledger server: java.lang.IllegalArgumentException: Invalid host or port: 98-alldocker_canton_1 5011) , context: {instance_uuid: "e87d45ea-a0b4-4916-ad09-f01b7b61a6f3"} 16-08-2021 07:56:00.088 [shutdownHook1] INFO com.daml.http.HttpService - Stopping server... , context: {instance_uuid: "e87d45ea-a0b4-4916-ad09-f01b7b61a6f3"} ``` cheers, kc ---
**Author:** ![kctam](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/kctam/32/1895_2.png) [@kctam](https://forum.canton.network/u/kctam)\ **Post date:** [August 16, 2021, 8:20am UTC](https://forum.canton.network/t/dockerized-json-api/2996/6 "2021-08-16T08:20:00Z")
Hi @stefanobaghino-da I just replicate this again. I just create a openjdk:11 container, and issue java command for json-api. (1) if I use canton container name in `--ledger-host`, timeout after 600 attempts and container down. (2) if I ping the canton container name, the IP address is correctly resolved, and ping is successful. (3) if I use IP of the canton container in `--ledger-host`, json-api is started and working well. Thanks again. cheers, kc ---
**Author:** ![Gary\_Verhaegen](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/gary_verhaegen/32/81_2.png) [@Gary\_Verhaegen](https://forum.canton.network/u/Gary_Verhaegen)\ **Post date:** [August 16, 2021, 8:21am UTC](https://forum.canton.network/t/dockerized-json-api/2996/7 "2021-08-16T08:21:02Z")
> [@cocreature](#): > > Also which docker container are you using? Seconding that question. I’ve had working setups using the `--link` option in the past. ---
**Author:** ![kctam](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/kctam/32/1895_2.png) [@kctam](https://forum.canton.network/u/kctam)\ **Post date:** [August 16, 2021, 8:22am UTC](https://forum.canton.network/t/dockerized-json-api/2996/8 "2021-08-16T08:22:06Z")
Hi @cocreature I’m using the bridge. In fact my setup I have three containers (1) Canton community, (2) PostgresDB and (3) json-api. All are in the same bridge network. In fact the (1) and (2) are working well, and i’m adding (3) to make a all-docker setup. ---
**Author:** ![kctam](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/kctam/32/1895_2.png) [@kctam](https://forum.canton.network/u/kctam)\ **Post date:** [August 16, 2021, 8:24am UTC](https://forum.canton.network/t/dockerized-json-api/2996/9 "2021-08-16T08:24:16Z")
hi @Gary_Verhaegen , i just use the image from openjdk:11 and copy http-json-1.15.0.jar from our release. Again if you have tried other container kindly let me know. cheers, kc ---
**Author:** ![Gary\_Verhaegen](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/gary_verhaegen/32/81_2.png) [@Gary\_Verhaegen](https://forum.canton.network/u/Gary_Verhaegen)\ **Post date:** [August 16, 2021, 8:28am UTC](https://forum.canton.network/t/dockerized-json-api/2996/10 "2021-08-16T08:28:11Z")
Could you share your entire process? 1. All involved Docker files. 2. Commands used to build the images. 3. Commands used to start containers. ---
**Author:** ![kctam](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/kctam/32/1895_2.png) [@kctam](https://forum.canton.network/u/kctam)\ **Post date:** [August 16, 2021, 8:35am UTC](https://forum.canton.network/t/dockerized-json-api/2996/11 "2021-08-16T08:35:57Z")
Here they are. 1 Dockerfile (only one) ```haskell FROM openjdk:11 COPY http-json-1.15.0.jar /usr/src WORKDIR /usr/src #CMD ["java", "-jar", "http-json-1.15.0.jar", "--ledger-host", "98-alldocker_canton_1", "--ledger-port", "5011", "--address", "0.0.0.0", "--http-port", "7575", "--allow-insecure-tokens"] ``` I commented out CMD as I’m issuing command directly in the container and perform various tests (using canton community container name and IP). 1. Command to build the image ```haskell docker build -t canton-jsonapi . ``` 1. Commands used to start containers. Here is the `docker-compose.yaml` for my three containers. ```haskell version: '3' services: cantondb: image: "postgres:11" hostname: canton-database environment: - POSTGRES_USER=test-user - POSTGRES_PASSWORD=test-password shm_size: 256mb volumes: - ./init.sql:/docker-entrypoint-initdb.d/init.sql ports: - 5432:5432 canton: image: digitalasset/canton-community:latest hostname: canton entrypoint: [] tty: true command: > sh -c " bin/canton -c $CANTON_CONF --bootstrap /config/bootstrap.canton" volumes: - ./config:/config:ro ports: - "5011:5011" - "5012:5012" - "5018:5018" - "5019:5019" depends_on: - cantondb canton-json: image: canton-jsonapi:latest hostname: canton-jsonapi tty: true ports: - 7575:7575 depends_on: - canton ``` Thanks. kc ---
**Author:** ![stefanobaghino-da](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/stefanobaghino-da/32/7057_2.png) [@stefanobaghino-da](https://forum.canton.network/u/stefanobaghino-da)\ **Post date:** [August 16, 2021, 8:48am UTC](https://forum.canton.network/t/dockerized-json-api/2996/12 "2021-08-16T08:48:50Z")
I’m not that much of an expert on `docker-compose`, but why is the hostname `canton-jsonapi` in the `docker-compose.yaml` file and `98-alldocker_canton_1` in the error logs (and `CMD` directive)? ---
**Author:** ![Gary\_Verhaegen](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/gary_verhaegen/32/81_2.png) [@Gary\_Verhaegen](https://forum.canton.network/u/Gary_Verhaegen)\ **Post date:** [August 16, 2021, 8:51am UTC](https://forum.canton.network/t/dockerized-json-api/2996/13 "2021-08-16T08:51:55Z")
It’s been a very long time since I last used `docker-compose`, and they seem to have added networking magic to it. Without a self-contained example I’m reduced to guessing a bit, but from that compose file (and the compose documentation) it looks like the DNS name you should use from the `canton-json` container is `canton`, not `98-alldocker_canton_1`, wherever that comes from. ---
**Author:** ![kctam](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/kctam/32/1895_2.png) [@kctam](https://forum.canton.network/u/kctam)\ **Post date:** [August 16, 2021, 9:33am UTC](https://forum.canton.network/t/dockerized-json-api/2996/14 "2021-08-16T09:33:03Z")
Hi @Gary_Verhaegen , @stefanobaghino-da and @cocreature , Thanks for your hints. Yes, it is docker-compose adding this as the container name. After using **canton** instead of the full name it works. Interesting enough, when I configure the postgresDB into canton configuration, I have to use that full name. For example here is what I did on canton.conf, ```haskell canton { participants { p1 { storage { type = postgres config { dataSourceClass = "org.postgresql.ds.PGSimpleDataSource" properties = { serverName = "98-alldocker_cantondb_1" portNumber = "5432" databaseName = "cantondb" user = "test-user" password = "test-password" } numThreads = 8 } } admin-api { port = 5012 address = 0.0.0.0 // default value if omitted } ledger-api { port = 5011 address = 0.0.0.0 // default value if omitted } } } } ``` And not to mention that the full name is ping-able inside the container. This distracts me in the configuration and troubleshooting. Once again, thanks a ton! Have a great day. cheers, kc ---
**Author:** ![Gary\_Verhaegen](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/gary_verhaegen/32/81_2.png) [@Gary\_Verhaegen](https://forum.canton.network/u/Gary_Verhaegen)\ **Post date:** [August 16, 2021, 10:22am UTC](https://forum.canton.network/t/dockerized-json-api/2996/15 "2021-08-16T10:22:10Z")
Glad you got it working!