Mesos to Consul bridge for service discovery.
Mesos-consul automatically registers/deregisters services run as Mesos tasks.
This means if you have a Mesos task called application
, this program will register the application in Consul, and it will be exposed via DNS as application.service.consul
.
This program also does Mesos leader discovery, so that leader.mesos.service.consul
will point to the current leader.
Table of Contents
- mesos-consul
- Comparisons to other discovery software
- [Mesos-dns](#mesos-dnshttpsgithubcommesospheremesos-dns)
- [Registrator](#registratorhttpsgithubcomgliderlabsregistrator)
- Building
- Running
- Usage
- Todo
- Comparisons to other discovery software
This project is similar to mesos-dns in that it polls Mesos to get information about tasks. However, instead of exposing this information via a built-in DNS server, we populate Consul service discovery with this information. Consul then exposes the services via DNS and via its API.
Benefits of using Consul:
- Integration with other tools like consul-template
- Multi-DC DNS lookups
- Configurable health checks that run on each system
Registrator is another tool that populates Consul (and other backends like etcd) with the status of Docker containers. However, Registrator is currently limited to reporting on Docker containers and does not track Mesos tasks.
docker build -t mesos-consul .
Mesos-consul can be run in a Docker container via Marathon. If your Zookeeper and Marathon services are registered in consul, you can use .service.consul
to find them, otherwise change the vaules for your environment:
curl -X POST [email protected] -H "Content-Type: application/json" http://marathon.service.consul:8080/v2/apps'
Where mesos-consul.json
is similar to (replacing the image with your image):
{
"args": [
"--zk=zk://zookeeper.service.consul:2181/mesos"
],
"container": {
"type": "DOCKER",
"docker": {
"network": "BRIDGE",
"image": "{{ mesos_consul_image }}:{{ mesos_consul_image_tag }}"
}
},
"id": "mesos-consul",
"instances": 1,
"cpus": 0.1,
"mem": 256
}
You can add options to authenticate via basic http or Consul token.
Option | Description |
---|---|
version |
Print mesos-consul version |
refresh |
Time between refreshes of Mesos tasks |
mesos-ip-order |
Comma separated list to control the order in which github.com/bapetc/mesos-consul searches or the task IP address. Valid options are 'netinfo', 'mesos', 'docker' and 'host' (default netinfo,mesos,host) |
healthcheck |
Enables a http endpoint for health checks. When this flag is enabled, serves health status on 127.0.0.1:24476 |
healthcheck-ip |
Health check service interface ip (default 127.0.0.1) |
healthcheck-port |
Health check service port. (default 24476) |
consul-auth |
The basic authentication username (and optional password), separated by a colon. |
consul-ssl |
Use HTTPS while talking to the registry. |
consul-ssl-verify |
Verify certificates when connecting via SSL. |
consul-ssl-cert |
Path to an SSL certificate to use to authenticate to the registry server |
consul-ssl-cacert |
Path to a CA certificate file, containing one or more CA certificates to use to valid the registry server certificate |
consul-token |
The registry ACL token |
heartbeats-before-remove |
Number of times that registration needs to fail before removing task from Consul. (default: 1) |
whitelist |
Only register services matching the provided regex. Can be specified multitple time |
service-name=<name> |
Service name of the Mesos hosts |
service-tags=<tag>,... |
Comma delimited list of tags to register the Mesos hosts. Mesos hosts will be registered as (leader |
zk * |
Location of the Mesos path in Zookeeper. The default value is zk://127.0.0.1:2181/mesos |
group-separator |
Choose the group separator. Will replace _ in task names (default is empty) |
Role | Registration |
---|---|
Leader |
leader.mesos.service.consul , master.mesos.service.consul |
Master |
master.mesos.service.consul |
Follower |
follower.mesos.service.consul |
Tasks are registered as task_name.service.consul
Tags can be added to consul by using labels in Mesos. If you are using Marathon you can add a label called tags
to your service definition with a comma-separated list of strings that will be registered in consul as tags.
For example, in your marathon service definition:
{
"id": "tagging-test",
"container": { /*...*/},
"labels": {
"tags": "label1,label2,label3"
}
}
This will result in a service tagging-test
being created in consul with 3 separate tags: label1
label2
and label3
// GET /v1/catalog/service/tagging-test
[
{
Node: "consul",
Address: "10.0.2.15",
ServiceID: "mesos-consul:10.0.2.15:tagging-test:31562",
ServiceName: "tagging-test5",
ServiceTags: [
"label1",
"label2",
"label3"
],
ServiceAddress: "10.0.2.15",
ServicePort: 31562
}
]
- Use task labels for metadata
- Support for multiple port tasks