Docker secrets not working when password has special characters - docker

Question

I am trying to run jenkins swarm agent using the docker-compose provided here.
Issue is I am using a service account provided by my admin team to authenticate against jenkins master and the password for the service account contains special characters \ (backslash) and / (forward slash). Example:
abcdefghifjd12\ab/
The docker secret I created using this password doesn't work. I tried with my personal account which doesn't have any special characters and this works as expected. So I believe issue is with how docker is interpreting these special characters when creating secrets. I tried escaping the back slash and using single quotes for the password but doesn't work. I tried below
#use password as it is in double quotes
echo "abcdefghifjd12\ab/" | docker secret create jenkins-user -
#use backslash to escape backslash
echo "abcdefghifjd12\\ab/" | docker secret create jenkins-user -
#use single quotes
echo 'abcdefghifjd12\ab/' | docker secret create jenkins-user -
None worked. How do I resolve this issue?
Server:
Version: 17.06.2-ee-6
API version: 1.30 (minimum version 1.12)
Go version: go1.8.3
Git commit: e75fdb8
Built: Mon Nov 27 22:44:25 2017
OS/Arch: linux/amd64
Experimental: false

Answer 1

With docker upgraded version I was able to do the same thing.
On SWARM I create a secret on manager-1:
[manager1] (local) root#192.168.0.41 ~
$ echo "abcdefghifjd12\ab/" | docker secret create jenkins-user -
jxykdlqklpo5ml81c4bfa9a4o
[manager1] (local) root#192.168.0.41 ~
$ docker service create --secret jenkins-user alpine sleep 1d
sgmrof1cwwubmhz1qqibu4aof
overall progress: 1 out of 1 tasks
1/1: running
verify: Service converged
[manager1] (local) root#192.168.0.41 ~
$ docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
sgmrof1cwwub wizardly_boyd replicated 1/1 alpine:latest
[manager1] (local) root#192.168.0.41 ~
[manager2] (local) root#192.168.0.43 ~
docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f4552c4718c5 alpine:latest "sleep 1d" 2 minutes ago Up 2 minutes wizardly_boyd.1.4gb4nwgiqagfyn10vuvt9pb4v
[manager2] (local) root#192.168.0.43 ~
$ docker exec -it f45 sh
/ # cd /run
/run # cd secrets/
/run/secrets # ls
jenkins-user
/run/secrets # cat jenkins-user
abcdefghifjd12\ab/
Docker Version information:
$ docker version
Client:
Version: 18.03.1-ce
API version: 1.37
Go version: go1.9.2
Git commit: 9ee9f40
Built: Thu Apr 26 07:12:25 2018
OS/Arch: linux/amd64
Experimental: false
Orchestrator: swarm
Server:
Engine:
Version: 18.03.1-ce
API version: 1.37 (minimum version 1.12)
Go version: go1.9.5
Git commit: 9ee9f40
Built: Thu Apr 26 07:23:03 2018
OS/Arch: linux/amd64
Experimental: true
[manager1] (local) root#192.168.0.41 ~