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![Configuration
$ sudo mkdir /etc/consul.d
$ echo ‘{“check”: {“name”: “ping”, “interval”: “30s”,
“script”: “ping –c1 google.com > /dev/null” }}’
> /etc/consul.d/ping.json
$ echo ‘{“service”: {“name”: “web”, “tags”: [“nancy”], “port”: 80,
“check”: {“interval”: “10s”, “script”:
“curl localhost > /dev/null 2 > &1”}}}’
> /etc/consul.d/web.json](https://image.slidesharecdn.com/consul-150902162502-lva1-app6891/85/Intro-to-Consul-7-320.jpg)
![consul agent -server
$ consul agent –server –data-dir /tmp/consul –config-dir /etc/consul.d
==> Starting Consul agent...
==> Starting Consul agent RPC...
==> Consul agent running!
Node name: ‘khellang’
Datacenter: ‘miles01’
Server: true
Client Addr: 127.0.0.1 (HTTP: 8500, DNS: 8600, RPC: 8400)
Cluster Add: 10.1.10.38 (LAN: 8301, WAN: 8302)
...
[INFO] agent: Synced service ‘web’
[INFO] agent: Synced check ‘service:web’
[INFO] agent: Synced check ‘ping’
[WARN] Check ‘service:web’ is now critical
...](https://image.slidesharecdn.com/consul-150902162502-lva1-app6891/85/Intro-to-Consul-8-320.jpg)
![consul members
$ consul members
Node Address Status Type Build Protocol
khellang 10.1.10.38:8301 alive server 0.5.1 2
$ curl localhost:8500/v1/catalog/nodes
[{“Node”:”khellang”,”Address”:”10.1.10.38”}]](https://image.slidesharecdn.com/consul-150902162502-lva1-app6891/85/Intro-to-Consul-9-320.jpg)
![Discover services
$ curl http://localhost:8500/v1/catalog/services/web
[{“Node”:”khellang”,”Address”:”10.1.10.38”,”ServiceID”:”web”,
“ServiceName”:”web”,”ServiceTags”:[“rails”],”ServicePort”:80}]](https://image.slidesharecdn.com/consul-150902162502-lva1-app6891/85/Intro-to-Consul-10-320.jpg)
![Checking Health
$ curl http://localhost:8500/v1/health/state/critical
[{“Node”:”khellang”,”CheckID”:”service:web”,
”Name”:”Service ‘web’ check”,”Status”:”critical”,”Notes”:””,
”ServiceID”:”web”,”ServiceName”:”web”}]](https://image.slidesharecdn.com/consul-150902162502-lva1-app6891/85/Intro-to-Consul-12-320.jpg)
Uploaded byKristian Hellang
Intro to Consul
Consul is a tool for service discovery, configuration and monitoring. It allows services to register themselves and discover other services via HTTP or DNS. Consul supports health checking of services, and prevents routing traffic to unhealthy hosts. It provides a key-value store for dynamic configuration of services. Configuration is done via JSON files in a config directory. The Consul agent runs on each node, joining nodes into a cluster. It monitors node and service health, and provides a web UI for viewing cluster status.
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Intro to Consul
- 1.
- 2. Consul Discover and configureservices
- 3. Host Clustering andFailure Detection Key/Value Configuration Storage Monitoring Services
- 4. Service Discovery • ProvideServices • Discover Services • HTTP and DNS • Support for SaaS services
- 5. Health Monitoring • Failuredetection • Collect metrics • Prevent routing to unhealthy hosts
- 6. Key/Value Storage • Simpleusage • Dynamic configuration
- 7. Configuration $ sudo mkdir/etc/consul.d $ echo ‘{“check”: {“name”: “ping”, “interval”: “30s”, “script”: “ping –c1 google.com > /dev/null” }}’ > /etc/consul.d/ping.json $ echo ‘{“service”: {“name”: “web”, “tags”: [“nancy”], “port”: 80, “check”: {“interval”: “10s”, “script”: “curl localhost > /dev/null 2 > &1”}}}’ > /etc/consul.d/web.json
- 8. consul agent -server $consul agent –server –data-dir /tmp/consul –config-dir /etc/consul.d ==> Starting Consul agent... ==> Starting Consul agent RPC... ==> Consul agent running! Node name: ‘khellang’ Datacenter: ‘miles01’ Server: true Client Addr: 127.0.0.1 (HTTP: 8500, DNS: 8600, RPC: 8400) Cluster Add: 10.1.10.38 (LAN: 8301, WAN: 8302) ... [INFO] agent: Synced service ‘web’ [INFO] agent: Synced check ‘service:web’ [INFO] agent: Synced check ‘ping’ [WARN] Check ‘service:web’ is now critical ...
- 9. consul members $ consulmembers Node Address Status Type Build Protocol khellang 10.1.10.38:8301 alive server 0.5.1 2 $ curl localhost:8500/v1/catalog/nodes [{“Node”:”khellang”,”Address”:”10.1.10.38”}]
- 10. Discover services $ curlhttp://localhost:8500/v1/catalog/services/web [{“Node”:”khellang”,”Address”:”10.1.10.38”,”ServiceID”:”web”, “ServiceName”:”web”,”ServiceTags”:[“rails”],”ServicePort”:80}]
- 11. consul join $ consuljoin 10.1.10.38 Successfully joined clusted by contacting 1 nodes. $ consul members Node Address Status Type Build Protocol khellang 10.1.10.38:8301 alive server 0.5.1 2 njmittet 10.1.10.39:8301 alive client 0.5.0 2
- 12. Checking Health $ curlhttp://localhost:8500/v1/health/state/critical [{“Node”:”khellang”,”CheckID”:”service:web”, ”Name”:”Service ‘web’ check”,”Status”:”critical”,”Notes”:””, ”ServiceID”:”web”,”ServiceName”:”web”}]
- 13.
Editor's Notes
- #3 Laget av HashiCorp, f