Using rkt to run containers

gistfile1.txt

$ sudo rkt --insecure-options=image run docker://redis
stage1: warning: no volume specified for mount point "volume-data", implicitly creating an "empty" volume. This volume will be removed when the pod is garbage-collected.
stage1: Docker converted image, initializing implicit volume with data contained at the mount point "volume-data".
stage1: warning: no volume specified for mount point "volume-data", implicitly creating an "empty" volume. This volume will be removed when the pod is garbage-collected.
stage1: Docker converted image, initializing implicit volume with data contained at the mount point "volume-data".
[20030.471072] redis[5]: 5:C 03 Mar 18:14:10.858 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
[20030.471791] redis[5]: 5:M 03 Mar 18:14:10.859 # You requested maxclients of 10000 requiring at least 10032 max file descriptors.
[20030.472056] redis[5]: 5:M 03 Mar 18:14:10.859 # Server can't set maximum open files to 10032 because of OS error: Operation not permitted.
[20030.472290] redis[5]: 5:M 03 Mar 18:14:10.859 # Current maximum open files is 4096. maxclients has been reduced to 4064 to compensate for low ulimit. If you need higher maxclients increase 'ulimit -n'.
[20030.472544] redis[5]:                 _._
[20030.472883] redis[5]:            _.-``__ ''-._
[20030.473129] redis[5]:       _.-``    `.  `_.  ''-._           Redis 3.2.6 (00000000/0) 64 bit
[20030.473355] redis[5]:   .-`` .-```.  ```\/    _.,_ ''-._
[20030.473581] redis[5]:  (    '      ,       .-`  | `,    )     Running in standalone mode
[20030.473805] redis[5]:  |`-._`-...-` __...-.``-._|'` _.-'|     Port: 6379
[20030.474071] redis[5]:  |    `-._   `._    /     _.-'    |     PID: 5
[20030.474288] redis[5]:   `-._    `-._  `-./  _.-'    _.-'
[20030.474498] redis[5]:  |`-._`-._    `-.__.-'    _.-'_.-'|
[20030.474711] redis[5]:  |    `-._`-._        _.-'_.-'    |           http://redis.io
[20030.474932] redis[5]:   `-._    `-._`-.__.-'_.-'    _.-'
[20030.475147] redis[5]:  |`-._`-._    `-.__.-'    _.-'_.-'|
[20030.475357] redis[5]:  |    `-._`-._        _.-'_.-'    |
[20030.475576] redis[5]:   `-._    `-._`-.__.-'_.-'    _.-'
[20030.475784] redis[5]:       `-._    `-.__.-'    _.-'
[20030.475993] redis[5]:           `-._        _.-'
[20030.476241] redis[5]:               `-.__.-'


$ sudo rkt list
UUID		APP	IMAGE NAME					STATE	CREATED		STARTED		NETWORKS
6134e37e	redis	registry-1.docker.io/library/redis:latest	running	7 seconds ago	7 seconds ago	default:ip4=172.16.28.2

$ sudo rkt stop 613
"6134e37e-8a82-4760-a48f-c5a498fbf5c3"

$ sudo rkt list
UUID		APP	IMAGE NAME					STATE	CREATED		STARTED		NETWORKS
6134e37e	redis	registry-1.docker.io/library/redis:latest	exited	5 minutes ago	5 minutes ago	

$ sudo rkt gc
gc: moving pod "6134e37e-8a82-4760-a48f-c5a498fbf5c3" to garbage
gc: pod "6134e37e-8a82-4760-a48f-c5a498fbf5c3" not removed: still within grace period (30m0s)

$ sudo rkt list
UUID		APP	IMAGE NAME					STATE		CREATED		STARTED		NETWORKS
6134e37e	redis	registry-1.docker.io/library/redis:latest	exited garbage	6 minutes ago	6 minutes ago	

$ sudo rkt status 613
state=exited garbage
created=2017-03-03 13:14:10.267 -0500 EST
started=2017-03-03 13:14:10.671 -0500 EST
pid=891
exited=true
app-redis=0

$ sudo rkt rm 613
"6134e37e-8a82-4760-a48f-c5a498fbf5c3"

$ sudo rkt list
UUID	APP	IMAGE NAME	STATE	CREATED	STARTED	NETWORKS

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$ sudo systemd-run --slice=machine rkt --insecure-options=image run docker://redis
Running as unit: run-r2ebc21d99f9243dc99ffc9667cb96142.service

$ sudo rkt list
UUID		APP	IMAGE NAME					STATE	CREATED		STARTED		NETWORKS
0eb94b4a	redis	registry-1.docker.io/library/redis:latest	running	1 second ago	1 second ago	default:ip4=172.16.28.2

$ systemctl status run-r2ebc21d99f9243dc99ffc9667cb96142.service 
● run-r2ebc21d99f9243dc99ffc9667cb96142.service - /usr/bin/rkt --insecure-options=image run docker://redis
   Loaded: loaded (/run/systemd/transient/run-r2ebc21d99f9243dc99ffc9667cb96142.service; transient; vendor preset: enabled)
Transient: yes
   Active: active (running) since Fri 2017-03-03 13:26:53 EST; 59s ago
 Main PID: 2337 (ld-linux-x86-64)
    Tasks: 6 (limit: 4915)
   CGroup: /machine.slice/run-r2ebc21d99f9243dc99ffc9667cb96142.service
           ├─2337 stage1/rootfs/usr/lib/ld-linux-x86-64.so.2 stage1/rootfs/usr/bin/systemd-nspawn --boot --notify-ready=yes --register=true --link-journal=try-guest --keep-unit --quiet --uuid=0eb94b4a-e1f5-4bb4-944d-23df05c85742 --m
           ├─init.scope
           │ └─2413 /usr/lib/systemd/systemd --default-standard-output=tty --log-target=null --show-status=0
           └─system.slice
             ├─redis.service
             │ └─2432 redis-server *:6379
             └─systemd-journald.service
               └─2416 /usr/lib/systemd/systemd-journald

Mar 03 13:26:55 laptappy rkt[2337]: [20795.152206] redis[5]:  |    `-._`-._        _.-'_.-'    |
Mar 03 13:26:55 laptappy rkt[2337]: [20795.152415] redis[5]:   `-._    `-._`-.__.-'_.-'    _.-'
Mar 03 13:26:55 laptappy rkt[2337]: [20795.152623] redis[5]:       `-._    `-.__.-'    _.-'
Mar 03 13:26:55 laptappy rkt[2337]: [20795.152832] redis[5]:           `-._        _.-'
Mar 03 13:26:55 laptappy rkt[2337]: [20795.153049] redis[5]:               `-.__.-'
Mar 03 13:26:55 laptappy rkt[2337]: [20795.153270] redis[5]: 5:M 03 Mar 18:26:55.537 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
Mar 03 13:26:55 laptappy rkt[2337]: [20795.153469] redis[5]: 5:M 03 Mar 18:26:55.537 # Server started, Redis version 3.2.6
Mar 03 13:26:55 laptappy rkt[2337]: [20795.153677] redis[5]: 5:M 03 Mar 18:26:55.537 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /
Mar 03 13:26:55 laptappy rkt[2337]: [20795.153884] redis[5]: 5:M 03 Mar 18:26:55.537 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix
Mar 03 13:26:55 laptappy rkt[2337]: [20795.154095] redis[5]: 5:M 03 Mar 18:26:55.537 * The server is now ready to accept connections on port 6379


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# https://kushaldas.in/posts/using-rkt-and-systemd.html
# https://medium.com/@adriaandejonge/moving-from-docker-to-rkt-310dc9aec938