Services
Learn about services.
This declaration allows you to provide detached (headless) container for the duration of a pipeline.
Services are always ran, in parallel alongside the ephemeral steps in the pipeline. They are extremely useful when your testing requires additional services such as a cache, database or queue.
Services are always created at the beginning of a pipeline in the order they are defined.
The name: field of the service defines what the hostname of the service will for available communicate to other tasks the pipeline.
However, there are times when you need more control over when a service is created. Perhaps you are dealing with a service that has start up dependencies and service A needs something to start up before service B is started.
See it in action with examples!
services:
# Starting a set of services at the beginning of
# pipeline execution
- name: cache
image: redis
- name: database
image: mongo
version: "1"
services:
# Starting a set of services at the beginning of
# pipeline execution
- name: cache
image: redis
steps:
- name: ping cache
image: redis
commands:
- redis-cli -h cache ping
# Now that we know redis is started we execute another
# service directly in the steps workflow
- name: database
image: postgres
detach: true
$ vela exec pipeline
...
[service: cache] 1:C 02 Feb 2021 21:24:10.600 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
[service: cache] 1:C 02 Feb 2021 21:24:10.600 # Redis version=6.0.10, bits=64, commit=00000000, modified=0, pid=1, just started
[service: cache] 1:C 02 Feb 2021 21:24:10.600 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
[service: cache] 1:M 02 Feb 2021 21:24:10.602 * Running mode=standalone, port=6379.
[service: cache] 1:M 02 Feb 2021 21:24:10.603 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
[service: cache] 1:M 02 Feb 2021 21:24:10.603 # Server initialized
[service: cache] 1:M 02 Feb 2021 21:24:10.603 * Ready to accept connections
[stage: ][step: ping cache] $ redis-cli -h cache ping
[stage: ][step: ping cache] PONG