Specialone

unique docker container with etcd service discovery.

Concept

kills old container with same SP_GROUP environment

Usage

npm intall

sudo npm install -g specialone

on Docker host

sudo specialone

Usage with Docker

on build

sudo docker build -t flrngel/specialone .

running daemon

sudo docker run --net=host -d -v /var/run/docker.sock:/var/run/docker.sock flrngel/specialone

environments

• SP_INTERVAL - miliseconds interval to check containers
• SP_NO_KILL - flag having true or false value to kill container
• SP_KILL_WAIT - waiting seconds to kill before on docker stop
• SP_KILL_TIMEOUT - seconds to kill after timeout on docker stop
• SP_ETCD_HOST - etcd host ex) 127.0.0.1:4001
• SP_ETCD_TTL - TTL for etcd keys

to group container, give docker environment as

• SP_GROUP - specialone will kill old containers with same group name
• SP_KILL_WAIT - overwrite waiting seconds to kill before on docker stop
• SP_KILL_TIMEOUT - overwrite seconds to kill after timeout on docker stop

Example

$ sudo docker run -d -v /var/run/docker.sock:/var/run/docker.sock flrngel/specialone
c9c334b73d20a9b6e1ae7c99abe36a0892f38661b5c4f1d9ca3985aff2cb8a4a

$ sudo docker run -d --name old -e SP_GROUP=redis redis:2.8.10
184ccc2879abf63b0ba87ec9d43ea3e2b088449656220912d01eba2bb1e9686f

$ sudo docker ps
CONTAINER ID        IMAGE                       COMMAND                CREATED             STATUS              PORTS               NAMES
184ccc2879ab        redis:2.8.10                "/entrypoint.sh redi   3 seconds ago       Up 2 seconds        6379/tcp            old                 
c9c334b73d20        flrngel/specialone:latest   "npm start"            18 seconds ago      Up 17 seconds                           pensive_lalande     

$ sudo docker run -d --name new -e SP_GROUP=redis redis:2.8.12
bf54222669f92e167ecbacaa2f1cb0f4aa2740788d89486b0ce1c9a3ba085769

$ sudo docker ps
CONTAINER ID        IMAGE                       COMMAND                CREATED              STATUS              PORTS               NAMES
bf54222669f9        redis:2.8.12                "/entrypoint.sh redi   2 seconds ago        Up 1 seconds        6379/tcp            new                 
c9c334b73d20        flrngel/specialone:latest   "npm start"            About a minute ago   Up About a minute                       pensive_lalande     

ETCD

• groups are in sp/ as sp/<SP_GROUP>
• discovery container as sp/<SP_GROUP>/<HOST_IP>:<CONTAINER_PORT>

TODO

• logging
• haproxy for port-exposed containers