vfarcic/go-demo

scripts/setup.sh

docker-compose \
    -f docker-compose-test.yml \
    run --rm unit

docker build -t vfarcic/go-demo .

docker tag vfarcic/go-demo vfarcic/go-demo:1.0

docker tag vfarcic/go-demo vfarcic/go-demo:1.1

docker push vfarcic/go-demo

docker push vfarcic/go-demo:1.0

docker push vfarcic/go-demo:1.1

docker-compose up -d db app

go-demo's Issues

go-demo can't connect to mongo db

Hi Viktor,
I am trying to setup my docker swarm based from the examples in The DevOps 2.1 Toolkit: Docker Swarm (excellent by the way!)

However when I create the go-demo service. the service failed:

[root@node1 ~]# docker logs 7148c0412577
panic: no reachable servers

goroutine 1 [running]:
panic(0x7b6480, 0xc8200c9be0)
/usr/local/go/src/runtime/panic.go:481 +0x3e6
main.setupDb()
/usr/src/myapp/main.go:43 +0xc5
main.main()
/usr/src/myapp/main.go:30 +0x14
[root@node1 ~]# docker ps -a

Here's my setup

[root@doc-machine ~]# docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS
30b0diuj42e1xi8nb1f6dcrum node2 Ready Active
8birurzpi03fbsmobk72keui7 manager2 Ready Active Reachable
9cr88tkl4xtyosdee9mmwly6h * manager1 Ready Active Leader
c53wp9ks0qcplme644v4m0zls node3 Ready Active
dp2n67k8cbtayqh8q3p1r9fjg node1 Ready Active

[root@node1 ~]# docker network ls
NETWORK ID NAME DRIVER SCOPE
8bd68935c031 bridge bridge local
bb69ba346363 docker_gwbridge bridge local
3ekgvwum4aop go-demo overlay swarm
131cd854ca31 host host local
9vyjyb8eci2q ingress overlay swarm
ae35a08628f6 none null local

ID NAME REPLICAS IMAGE COMMAND
2ay9q7t57zjm proxy 1/1 vfarcic/docker-flow-proxy
7wpms6fjw3lo go-demo-db 1/1 mongo:3.2.10
85dzs6wx7h2y go-demo 0/1 vfarcic/go-demo:1.0
f2b6u7eqnr9o util global alpine sleep 1000000000
[root@doc-machine ~]#

I can't figure out what is causing the issue

Thank's

Regards

Robert

go-demo service/container keeps failing... same issue that was "closed"

I am running into the exact same problem. I have created the 3 nodes on AWS using docker machine. The Mongo DB starts up fine but the the go-demo app keeps failing. I have kept the security group wide open to allow all traffic.

unit service not working

❯ docker-compose -f docker-compose-test-local.yml  run --rm unit
WARN[0000] The "HOST_IP" variable is not set. Defaulting to a blank string.
Fetching https://gopkg.in/mgo.v2?go-get=1
Parsing meta tags from https://gopkg.in/mgo.v2?go-get=1 (status code 200)
get "gopkg.in/mgo.v2": found meta tag get.metaImport{Prefix:"gopkg.in/mgo.v2", VCS:"git", RepoRoot:"https://gopkg.in/mgo.v2"} at https://gopkg.in/mgo.v2?go-get=1
go: finding gopkg.in/mgo.v2 v2.0.0-20180705113604-9856a29383ce
go: gopkg.in/[email protected]: git fetch -f https://gopkg.in/mgo.v2 refs/heads/*:refs/heads/* refs/tags/*:refs/tags/* in /go/pkg/mod/cache/vcs/71c6fba555fd7b185c93dcad3ed507d63007e825cf56a4a329b0e102990a7036: exit status 128:
        fatal: unable to access 'https://gopkg.in/mgo.v2/': server certificate verification failed. CAfile: none CRLfile: none
go: error loading module requirements

I don't know about Go well yet, but the package seems deprecated.

go get: -t flag is a no-op when using modules

10:19 $ docker-compose -f docker-compose-test-local.yml run --rm staging
WARNING: The HOST_IP variable is not set. Defaulting to a blank string.
go get: -t flag is a no-op when using modules
=== RUN   TestIntegrationTestSuite
=== RUN   TestIntegrationTestSuite/Test_Hello_ReturnsStatus200
=== RUN   TestIntegrationTestSuite/Test_Person_ReturnsStatus200
--- PASS: TestIntegrationTestSuite (0.01s)
    --- PASS: TestIntegrationTestSuite/Test_Hello_ReturnsStatus200 (0.00s)
    --- PASS: TestIntegrationTestSuite/Test_Person_ReturnsStatus200 (0.00s)
=== RUN   TestMainSuite
=== RUN   TestMainSuite/Test_HelloServer_Waits_WhenDelayIsPresent
=== RUN   TestMainSuite/Test_HelloServer_WritesHelloWorld
=== RUN   TestMainSuite/Test_HelloServer_WritesNokEventually
=== RUN   TestMainSuite/Test_HelloServer_WritesOk
=== RUN   TestMainSuite/Test_PersonServer_InvokesUpsertId_WhenPutPerson
=== RUN   TestMainSuite/Test_PersonServer_Panics_WhenFindReturnsError
=== RUN   TestMainSuite/Test_PersonServer_Panics_WhenUpsertIdReturnsError
=== RUN   TestMainSuite/Test_PersonServer_WritesPeople
=== RUN   TestMainSuite/Test_RunServer_InvokesListenAndServe
=== RUN   TestMainSuite/Test_SetupMetrics_InitializesHistogram
--- PASS: TestMainSuite (0.01s)
    --- PASS: TestMainSuite/Test_HelloServer_Waits_WhenDelayIsPresent (0.00s)
    --- PASS: TestMainSuite/Test_HelloServer_WritesHelloWorld (0.00s)
    --- PASS: TestMainSuite/Test_HelloServer_WritesNokEventually (0.00s)
    --- PASS: TestMainSuite/Test_HelloServer_WritesOk (0.00s)
    --- PASS: TestMainSuite/Test_PersonServer_InvokesUpsertId_WhenPutPerson (0.00s)
    --- PASS: TestMainSuite/Test_PersonServer_Panics_WhenFindReturnsError (0.00s)
    --- PASS: TestMainSuite/Test_PersonServer_Panics_WhenUpsertIdReturnsError (0.00s)
    --- PASS: TestMainSuite/Test_PersonServer_WritesPeople (0.00s)
    --- PASS: TestMainSuite/Test_RunServer_InvokesListenAndServe (0.00s)
    --- PASS: TestMainSuite/Test_SetupMetrics_InitializesHistogram (0.00s)
PASS
ok  	go-demo-6	0.030s

go test fails

On Ubuntu:

max@max-x1:~/work/go-demo$ docker-compose -f docker-compose-test-local.yml run --rm unit
WARNING: The HOST_IP variable is not set. Defaulting to a blank string.
src/github.com/stretchr/testify/assert/assertions.go:17:2: cannot find package "github.com/davecgh/go-spew/spew" in any of:
	/usr/local/go/src/github.com/davecgh/go-spew/spew (from $GOROOT)
	/go/src/github.com/davecgh/go-spew/spew (from $GOPATH)
src/github.com/stretchr/testify/assert/assertions.go:18:2: cannot find package "github.com/pmezard/go-difflib/difflib" in any of:
	/usr/local/go/src/github.com/pmezard/go-difflib/difflib (from $GOROOT)
	/go/src/github.com/pmezard/go-difflib/difflib (from $GOPATH)
src/github.com/stretchr/testify/mock/mock.go:14:2: cannot find package "github.com/stretchr/objx" in any of:
	/usr/local/go/src/github.com/stretchr/objx (from $GOROOT)
	/go/src/github.com/stretchr/objx (from $GOPATH)
package ./src/gopkg.in/mgo.v2
	imports gopkg.in/mgo.v2/internal/scram: use of internal package not allowed
package ./src/gopkg.in/mgo.v2/bson
	imports gopkg.in/mgo.v2/internal/json: use of internal package not allowed
src/gopkg.in/mgo.v2/dbtest/dbserver.go:13:2: cannot find package "gopkg.in/tomb.v2" in any of:
	/usr/local/go/src/gopkg.in/tomb.v2 (from $GOROOT)
	/go/src/gopkg.in/tomb.v2 (from $GOPATH)



max@max-x1:~/work/go-demo$ docker-machine ls 
NAME      ACTIVE   DRIVER       STATE     URL                         SWARM   DOCKER    ERRORS
go-demo   *        virtualbox   Running   tcp://192.168.99.100:2376           v1.13.1   



max@max-x1:~/work/go-demo$ docker-machine --version
docker-machine version 0.9.0, build 15fd4c7
max@max-x1:~/work/go-demo$ docker-compose --version
docker-compose version 1.10.0, build 4bd6f1a
max@max-x1:~/work/go-demo$ docker --version
Docker version 1.13.1, build 092cba3
max@max-x1:~/work/go-demo$ 

Any ideas what I am doing wrong?

'docker-compose-test-local.yml' unit doesn't work on windows

this is my first issue in my life.
and i'm not native english.
sorry.

i installed docker toolbox on windows.
and made go-demo docker machine virtual driver.
i get sources from this git repository (thank you. that is very nice all things)
to my path ( e:/project/go-demo/... )

so, i did test by command ( docker-compose -f docker-compose-test-lcoal.yml run -d --rm unit )

and i typeed to get log info. but received massage about ' can't compile on path /usr/bin/myapp/. because not found source ' maybe. but that meaning.

so i did those commands in my linux Vagrant server only using 'docker-compose and docker' , but it works well.

i wonder why it didn't work on windows ( Docker quick terminal )
i love your all books. bye

go-demo can't connect to mongo db Vol2

Hi Viktor!
Actually I am going thru the DevOps2.1 book and I really enjoy it:)
I started to play with the exercises but I stuck with the go-demo with mongo DB.
I have a very similar issue as rlaflamme had, except in my case not the firewall is the problem.

If I manually create a container I can write a python code which can interact with the go-demo-db. So the network connection looks fine.
But still the go-demo cannot connect to the DB. Env variables are fine, names ok as well.

This is what I can see in the logs. I hope you can shed some light what I missed here:)
Thank you!

docker@dockerVM1:~$ docker service ps c1lncxif6wre
ID            NAME           IMAGE                NODE       DESIRED STATE  CURRENT STATE           ERROR                      PORTS
wjsjqoqqawwd  go-demo.1      vfarcic/go-demo:1.0  dockerVM1  Running        Starting 3 seconds ago
pbrutjvn0tst   \_ go-demo.1  vfarcic/go-demo:1.0  dockerVM1  Shutdown       Failed 8 seconds ago    "task: non-zero exit (2)"
docker@dockerVM1:~$

docker@dockerVM1:~$ docker logs cc0765a6f497
panic: no reachable servers

goroutine 1 [running]:
panic(0x7b6480, 0xc82005b510)
        /usr/local/go/src/runtime/panic.go:481 +0x3e6
main.setupDb()
        /usr/src/myapp/main.go:43 +0xc5
main.main()
        /usr/src/myapp/main.go:30 +0x14

docker@dockerVM1:~$ docker service inspect go-demo --pretty

ID:             c1lncxif6wreegelqlaeytn2e
Name:           go-demo
Service Mode:   Replicated
 Replicas:      1
Placement:
UpdateConfig:
 Parallelism:   1
 On failure:    pause
 Max failure ratio: 0
ContainerSpec:
 Image:         vfarcic/go-demo:1.0@sha256:a578350216c5939ee518c9f57d040cf8a54ebc5d1a85292bfdf505394b040e5b
 Env:           DB=go-demo-db
Resources:
Networks: go-demo
Endpoint Mode:  vip
docker@dockerVM1:~$ docker service inspect go-demo-db --pretty

ID:             xkfr7ngsbgu44pqxmoxf1ab3c
Name:           go-demo-db
Service Mode:   Replicated
 Replicas:      1
Placement:
UpdateConfig:
 Parallelism:   1
 On failure:    pause
 Max failure ratio: 0
ContainerSpec:
 Image:         mongo:3.2.10@sha256:532a19da83ee0e4e2a2ec6bc4212fc4af26357c040675d5c2629a4e4c4563cef
Resources:
Networks: go-demo
Endpoint Mode:  vip
docker@dockerVM1:~$

Jenkinsfile with declarative syntax doesn't connect to docker-engine at $DOCKER_HOST

Hello Viktor,

in line 29 of 'Jenkinsfile' during a Jenkins run I get the error:

• DOCKER_HOST=tcp://192.168.99.100:2375 docker service update --image localhost:5000/myservice:2.12 myservice
  Cannot connect to the Docker daemon at tcp://192.168.99.100:2375. Is the docker daemon running?

Trying this command inside the jenkins-agent container braught me to a working solution:
Also set DOCKER_MACHINE_NAME and DOCKER_CERT_PATH.

Thanx for your terrific work!

bye
Stephan

failed Test_Hello_ReturnsStatus200

This error is not isolated at Mac OS X system, but even in Debian Linux.

Version

[Mac OS X]
pirate$ docker --version
Docker version 17.03.1-ce, build c6d412e

pirate$ docker-machine --version
docker-machine version 0.10.0, build 76ed2a6

pirate$ docker-compose --version
docker-compose version 1.11.2, build dfed245

pirate$ uname -a
Darwin pirate-MBP 16.5.0 Darwin Kernel Version 16.5.0: Fri Mar  3 16:52:33 PST 2017; root:xnu-3789.51.2~3/RELEASE_X86_64 x86_64

[Debian Linux]
pirate$ docker --version
Docker version 17.03.1-ce, build c6d412e

pirate$ docker-machine --version
docker-machine version 0.10.0 build 76ead2a6

pirate$ uname -a
Linux debian 3.16.0-4 amd64 #1 SMP Debian 3.16.39+deb8u2 (2017-03-07) x86_64 GNU/Linux

Steps to reproduce the issue:

[you can try even within a docker-machine node with virtualbox or pwd driver, the result is the same  ]
pirate$ docker-compose -f docker-compose-test-local.yml  up -d staging-dep
Creating godemo_db_1
Creating godemo_staging-dep_1

pirate$ docker-compose  -f docker-compose-test-local.yml ps
WARNING: The HOST_IP variable is not set. Defaulting to a blank string.
        Name                  Command          State           Ports          
-----------------------------------------------------------------------------
godemo_db_1            /entrypoint.sh mongod   Up      27017/tcp              
godemo_staging-dep_1   go-demo                 Up      0.0.0.0:8080->8080/tcp 

pirate$ docker-compose  -f docker-compose-test-local.yml run --rm staging
WARNING: The HOST_IP variable is not set. Defaulting to a blank string.
Pulling staging (golang:1.6)...
1.6: Pulling from library/golang
....
=== RUN   TestIntegrationTestSuite
=== RUN   Test_Hello_ReturnsStatus200
--- FAIL: Test_Hello_ReturnsStatus200 (20.00s)
        Error Trace:    integration_test.go:48
	Error:      	Received unexpected error:
	            	Get http://staging-dep:8080/demo/hello: dial tcp: lookup staging-dep on 10.0.2.3:53: read udp 10.0.2.15:52485->10.0.2.3:53: i/o timeout
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x0 pc=0x486092]

goroutine 6 [running]:
panic(0x8ab9e0, 0xc82000e0b0)
	/usr/local/go/src/runtime/panic.go:481 +0x3e6
testing.tRunner.func1(0xc82007e120)
	/usr/local/go/src/testing/testing.go:467 +0x192
panic(0x8ab9e0, 0xc82000e0b0)
	/usr/local/go/src/runtime/panic.go:443 +0x4e9
_/usr/src/myapp.IntegrationTestSuite.Test_Hello_ReturnsStatus200(0xc8201ee560, 0xc8201ee570, 0xc82007e120, 0xc82000a068, 0x10)
	/usr/src/myapp/integration_test.go:49 +0x232
_/usr/src/myapp.(*IntegrationTestSuite).Test_Hello_ReturnsStatus200(0xc8200514d0)
	<autogenerated>:77 +0x98
reflect.Value.call(0x7e5860, 0x93dad8, 0x13, 0x945710, 0x4, 0xc820043f08, 0x1, 0x1, 0x0, 0x0, ...)
	/usr/local/go/src/reflect/value.go:435 +0x120d
reflect.Value.Call(0x7e5860, 0x93dad8, 0x13, 0xc820043f08, 0x1, 0x1, 0x0, 0x0, 0x0)
	/usr/local/go/src/reflect/value.go:303 +0xb1
github.com/stretchr/testify/suite.Run.func2(0xc82007e120)
	/go/src/github.com/stretchr/testify/suite/suite.go:101 +0x3c9
testing.tRunner(0xc82007e120, 0xc8201f0660)
	/usr/local/go/src/testing/testing.go:473 +0x98
created by testing.RunTests
	/usr/local/go/src/testing/testing.go:582 +0x892
exit status 2
FAIL	_/usr/src/myapp	20.013s

Error running examples in CI chapter

Hi Viktor, thanks for wonderful book I enjoy reading it

Please help with this error in Windows10/Virtualbox doesn't allow me to continue with the examples :(

The command I issued:
docker-compose -f docker-compose-test-local.yml run --rm unit

Thanks in advance!

tmp/go/src/github.com/stretchr/testify/assert/assertions.go:17:2: cannot find package "github.com/davecgh/go-spew/spew" in any of:
        /usr/local/go/src/github.com/davecgh/go-spew/spew (from $GOROOT)
        /go/src/github.com/davecgh/go-spew/spew (from $GOPATH)
tmp/go/src/github.com/stretchr/testify/assert/assertions.go:18:2: cannot find package "github.com/pmezard/go-difflib/difflib" in any of:
        /usr/local/go/src/github.com/pmezard/go-difflib/difflib (from $GOROOT)
        /go/src/github.com/pmezard/go-difflib/difflib (from $GOPATH)
tmp/go/src/github.com/stretchr/testify/mock/mock.go:14:2: cannot find package "github.com/stretchr/objx" in any of:
        /usr/local/go/src/github.com/stretchr/objx (from $GOROOT)
        /go/src/github.com/stretchr/objx (from $GOPATH)
package ./tmp/go/src/gopkg.in/mgo.v2
        imports gopkg.in/mgo.v2/internal/scram: use of internal package not allowed
package ./tmp/go/src/gopkg.in/mgo.v2/bson
        imports gopkg.in/mgo.v2/internal/json: use of internal package not allowed
tmp/go/src/gopkg.in/mgo.v2/dbtest/dbserver.go:13:2: cannot find package "gopkg.in/tomb.v2" in any of:
        /usr/local/go/src/gopkg.in/tomb.v2 (from $GOROOT)
        /go/src/gopkg.in/tomb.v2 (from $GOPATH)