Создал дефолтный job

andrew@monster:~/atuko/cluster$ nomad init
Example job file written to example.nomad

Поправил update

  update {
    max_parallel = 1
    min_healthy_time = "10s"
    healthy_deadline = "3m"
    auto_revert = true
    canary = 1
  }

Запустил

andrew@monster:~/atuko/cluster$ nomad run example.nomad
==> Monitoring evaluation "9d93d6b3"
    Evaluation triggered by job "example"
    Allocation "0bd15c0d" created: node "6b9acd5a", group "cache"
    Evaluation within deployment: "476d5a8d"
    Evaluation status changed: "pending" -> "complete"
==> Evaluation "9d93d6b3" finished with status "complete"


andrew@monster:~/atuko/cluster$ nomad status example
ID            = example
Name          = example
Submit Date   = 01/23/18 20:39:53 MSK
Type          = service
Priority      = 50
Datacenters   = dc1
Status        = running
Periodic      = false
Parameterized = false

Summary
Task Group  Queued  Starting  Running  Failed  Complete  Lost
cache       0       0         1        0       0         0

Latest Deployment
ID          = 476d5a8d
Status      = running
Description = Deployment is running

Deployed
Task Group  Auto Revert  Desired  Placed  Healthy  Unhealthy
cache       true         1        1       0        0

Allocations
ID        Node ID   Task Group  Version  Desired  Status   Created  Modified
0bd15c0d  6b9acd5a  cache       0        run      running  15s ago  2s ago


В consul сервис зарегался

andrew@monster:~/atuko/cluster$ consul catalog services
consul
global-redis-check
nomad
nomad-client


andrew@monster:~/atuko/cluster$ dig @127.0.0.1 -p 8600 global-redis-check.service.consul. SRV
;; ANSWER SECTION:
global-redis-check.service.consul. 0 IN	SRV	1 1 21471 monster.node.dc1.consul.

;; ADDITIONAL SECTION:
monster.node.dc1.consul. 0	IN	A	127.0.0.1
monster.node.dc1.consul. 0	IN	TXT	"consul-network-segment="


Поменял image

andrew@monster:~/atuko/cluster$ nomad plan example.nomad
+/- Job: "example"
+/- Task Group: "cache" (1 canary, 1 ignore)
  +/- Task: "redis" (forces create/destroy update)
    +/- Config {
      +/- image:           "redis:3.2" => "redis:4.0"
          port_map[0][db]: "6379"
        }

Scheduler dry-run:
- All tasks successfully allocated.

Job Modify Index: 11
To submit the job with version verification run:

nomad run -check-index 11 example.nomad


Запустил

andrew@monster:~/atuko/cluster$ nomad run -check-index 11 example.nomad
==> Monitoring evaluation "10591c5d"
    Evaluation triggered by job "example"
    Allocation "a492b4d2" created: node "6b9acd5a", group "cache"
    Evaluation within deployment: "69006ac8"
    Evaluation status changed: "pending" -> "complete"
==> Evaluation "10591c5d" finished with status "complete"


andrew@monster:~/atuko/cluster$ nomad status example
ID            = example
Name          = example
Submit Date   = 01/23/18 20:42:24 MSK
Type          = service
Priority      = 50
Datacenters   = dc1
Status        = running
Periodic      = false
Parameterized = false

Summary
Task Group  Queued  Starting  Running  Failed  Complete  Lost
cache       0       0         2        0       0         0

Latest Deployment
ID          = 69006ac8
Status      = running
Description = Deployment is running but requires promotion

Deployed
Task Group  Auto Revert  Promoted  Desired  Canaries  Placed  Healthy  Unhealthy
cache       true         false     1        1         1       0        0

Allocations
ID        Node ID   Task Group  Version  Desired  Status   Created    Modified
a492b4d2  6b9acd5a  cache       1        run      running  17s ago    12s ago
0bd15c0d  6b9acd5a  cache       0        run      running  2m48s ago  2m22s ago


В consul появилась вторая запись

andrew@monster:~/atuko/cluster$ dig @127.0.0.1 -p 8600 global-redis-check.service.consul. SRV
;; ANSWER SECTION:
global-redis-check.service.consul. 0 IN	SRV	1 1 21471 monster.node.dc1.consul.
global-redis-check.service.consul. 0 IN	SRV	1 1 22312 monster.node.dc1.consul.

;; ADDITIONAL SECTION:
monster.node.dc1.consul. 0	IN	A	127.0.0.1
monster.node.dc1.consul. 0	IN	TXT	"consul-network-segment="
monster.node.dc1.consul. 0	IN	A	127.0.0.1
monster.node.dc1.consul. 0	IN	TXT	"consul-network-segment="


Фэйлю последний деплоймент

andrew@monster:~/atuko/cluster$ nomad deployment fail 69006ac8
Deployment "69006ac8-ed65-369d-1405-2918d494a948" failed. Auto-reverted to job version 0.

==> Monitoring evaluation "88eec8d4"
    Evaluation triggered by job "example"
    Evaluation within deployment: "69006ac8"
    Allocation "0bd15c0d" modified: node "6b9acd5a", group "cache"
    Evaluation status changed: "pending" -> "complete"
==> Evaluation "88eec8d4" finished with status "complete"


andrew@monster:~/atuko/cluster$ nomad status example
ID            = example
Name          = example
Submit Date   = 01/23/18 20:39:53 MSK
Type          = service
Priority      = 50
Datacenters   = dc1
Status        = running
Periodic      = false
Parameterized = false

Summary
Task Group  Queued  Starting  Running  Failed  Complete  Lost
cache       0       0         1        0       1         0

Latest Deployment
ID          = 7df5508d
Status      = successful
Description = Deployment completed successfully

Deployed
Task Group  Auto Revert  Desired  Placed  Healthy  Unhealthy
cache       true         1        1       1        0

Allocations
ID        Node ID   Task Group  Version  Desired  Status    Created     Modified
a492b4d2  6b9acd5a  cache       1        stop     complete  17m31s ago  39s ago
0bd15c0d  6b9acd5a  cache       2        run      running   20m2s ago   29s ago


и в consul остаётся одна запись

andrew@monster:~/atuko/cluster$ dig @127.0.0.1 -p 8600 global-redis-check.service.consul. SRV
;; ANSWER SECTION:
global-redis-check.service.consul. 0 IN	SRV	1 1 21471 monster.node.dc1.consul.

;; ADDITIONAL SECTION:
monster.node.dc1.consul. 0	IN	A	127.0.0.1
monster.node.dc1.consul. 0	IN	TXT	"consul-network-segment="