podman events output jsonlines

[muayyad-alsadi]

/kind feature

Description

to make parsing podman events I need it to be in jsonlines (aka ndjson)

current output

$ podman events
2019-05-19 12:19:13.962020795 +0300 EEST container init 0c3b587013968ce5adc5f2dcbbcfd691c3f162bf43798f885d89769c68529d92 (image=docker.io/library/busybox:latest, name=my)
2019-05-19 12:19:14.086438455 +0300 EEST container start 0c3b587013968ce5adc5f2dcbbcfd691c3f162bf43798f885d89769c68529d92 (image=docker.io/library/busybox:latest, name=my)
2019-05-19 12:19:46.604928881 +0300 EEST container create 4871dacac25d09b95a00e3a72111c6813fa4e46941afdfe52b074c6e60f83072 (image=docker.io/library/busybox:latest, name=tender_mclaren)
2019-05-19 12:21:11.308193704 +0300 EEST container init 4871dacac25d09b95a00e3a72111c6813fa4e46941afdfe52b074c6e60f83072 (image=docker.io/library/busybox:latest, name=tender_mclaren)
2019-05-19 12:21:11.308565427 +0300 EEST container attach 4871dacac25d09b95a00e3a72111c6813fa4e46941afdfe52b074c6e60f83072 (image=docker.io/library/busybox:latest, name=tender_mclaren)
2019-05-19 12:21:11.357720034 +0300 EEST container start 4871dacac25d09b95a00e3a72111c6813fa4e46941afdfe52b074c6e60f83072 (image=docker.io/library/busybox:latest, name=tender_mclaren)

it seems there is no way to make it json

$ man podman events
...
--format
       Format the output using the given Go template.  An output value of json is not supported.

if you just dump a json per line with whatever internal format might work, but something like this would be better

{"time": 123, "kind": "container", "status":"start", "container_id":"123ee",  "from": "busybox", ...}
{"time": 123, "kind": "pod": "status":"start", "pod_id":"321aa", ...}

[baude]

can you elaborate on why you want this? how will it be used? whats the use case?

[muayyad-alsadi]

a readline loop that listen to those events
and when a new container is up or down load-balancer (haproxy) configuration is updated based on template to expose it to some subdomain based on some label

like docker-balancer or docker-glue

something like this

podman run -d --name wp1 -l glue.subdomain='wp1' mywordpress/wordpress 
podman run -d --name wp2 -l glue.subdomain='wp2' mywordpress/wordpress 
curl wp1.myuser.example.com/
curl wp2.myuser.example.com/

[rhatdan]

Seems like a reasonable request.