“resetting” docker

I tried to run “docker –version” on my Mac and it hung. That’s odd. I rebooted and same thing. After some useless fiddling, I decided to try reinstalling. Here’s what I did:

  1. Deleted /docker folder from Applications (this was the old Toolkit which I think I haven’t used in ages)
  2. Tried to delete Docker app from Applications. That failed because it was in use.
  3. Opened Activity Monitor and killed docker
  4. Actually deleted Docker app from Applications.
  5. Reinstalled Docker Desktop

While this was likely way overkill, it worked. And once I stopped fiddling, it took less than 15 minutes

Update: The next time I tried to do something, I got a prompt to accept XCode’s license agreement. That was likely the original problem causing the “hang”

[2019 oracle code one] CD with Docker and Java

Continuous Delivery with Docker Containers and Java: The Good, the Bad, and the Ugly

Speaker: Daniel Bryant @danielbryantuk

For more blog posts, see The Oracle Code One table of contents


  • “Continuous delivery is achieved when stability and speed can satisfy business demand. Discontinuous delivery occurs when stability and speed are insufficient” – Steve Smith @SteveSmithCD
  • Feedback loop
  • Choices are about tradeoffs


  • Dev environment setup can be Dockerized/Containerized
  • Repeatable builds
  • Legacy technology can be sealed


  • Why is the container image 1GB for a hello world app
  • Dev/test/deploy/loop too long
  • The app runs slow/freezes on Docker

Impact of container tech on CD

  • Install Docker/container on local machine. Important to understand platform deploying to (mechanical sympathy).
  • Store container image, not jar/war
  • Test in container image
  • Container image is single binary – “Build Binaries Only Once (BBOO)”


  • Make dev env like prod as much as possible. Use identical base image with same config.
  • Dockerfile content is super important – OS, ports, volumes, JDK
  • Talk to the sysadmin people. Their operational knowledge is invaluable. Avoids both operational and political problems
  • Don’t want JDK in production. [so what use. JRE no longer exists. Can’t use JLink if need Tomcat to run app.
  • Avoid unused Maven dependencies (so smaller]
  • BuildKit – best effort caching
  • Get app/config drift if have different dev/prod containers
  • Use sidecar containers to bundle other things
  • Toolchain may alter when go to container space.
  • Metadata is valuable. Need to know what is running where. Can store in external registry. ex: Artifactory or Nexus
  • Try to do component testing – a few services together
  • Performance – gatling, jmeter, flood.io
  • Security testing – ex: https://find-sec-bugs.github.io
  • Migrate to Java 11 for speed
  • AOT gives performance in short term and JIT in long term
  • Re test app when change any config
  • Set container memory appropriately
  • Dependency check – https://jeremylong.github.io/DependencyCheck/dependency-check-maven/
  • Docker container scanner – https://github.com/arminc/clair-scanner or https://github.com/aquasecurity/microscanner
  • Only thing worse than not using a security tool is using an unmaintained security tool

My take

Good session. The advice covered different levels of problems which was nice. The flowchart was unreadable. I think I got the gist, but it’s hard to get a complex flow on the screen. The rest was clear and I came away with a bunch of stuff to read about

setup for HOL-4957 – Automating Your CI/CD Stack with Java and Groovy

Scott and I’ll be leading a hands on lab “Automating your Ci/CD Stack with Java and Groovy” at Oracle Code One. This is a BYOL (bring your own laptop) lab.

If you run into any trouble setting up for the lab, you can post a comment on this blog post or start a thread in the Cloud/Virtualization forum at CodeRanch.

This lab requires the following:

  1. Docker
  2. Docker images
  3. Enough disk space
  4. The ability to run curl
  5. Optional: JDK 8
  6. Optional: Groovy

1 – Docker

To install Docker, follow the instructions at: https://docs.docker.com/install/


At the command line, run docker –version. (Small version differences are ok in the output)

$ docker --version

Docker version 18.06.0-ce, build 0ffa825

2 – Docker images

These images a little under 2GB combined. So as not to tax the conference network, please pull them in advance. This will also let you deal with any corporate internet proxies while you are still at work and can ask for help.

At the command line run:

docker pull sonatype/nexus3:3.13.0

docker pull jenkins/jenkins:2.146

docker pull sonarqube:7.1

 Note: “latest” will probably work. These version numbers are the ones we tested with.

$ docker pull sonatype/nexus3:3.13.0
3.13.0: Pulling from sonatype/nexus3
256b176beaff: Pull complete
18d124afa1e9: Pull complete
9bb412307f82: Pull complete
Digest: sha256:19d186d5bc8be1ea4f7bae72756baa830e79bf20aae0e9e7b1a0c7d3ce7ac136
Status: Downloaded newer image for sonatype/nexus3:3.13.0

$ docker pull jenkins/jenkins:2.146
2.146: Pulling from jenkins/jenkins
55cbf04beb70: Pull complete
1607093a898c: Pull complete
9a8ea045c926: Pull complete
d4eee24d4dac: Pull complete
c58988e753d7: Pull complete
794a04897db9: Pull complete
70fcfa476f73: Pull complete
806029475e0c: Pull complete
67959b355155: Pull complete
4d217ccd3d4c: Pull complete
0261bb88a4a5: Pull complete
96f2a3ae5539: Pull complete
f6bf99db32d5: Pull complete
bb47d4bbb0e1: Pull complete
4b48ec5d60cf: Pull complete
7280a8dfb767: Pull complete
91091f8d44ca: Pull complete
8ca02cad320f: Pull complete
46009bfec329: Pull complete
f9860b79812e: Pull complete
89ac8103ea67: Pull complete
Digest: sha256:161cb25fbb23a1c5ac5fdd0feebd713edd62c235e199e68b34d1a78205a42da7
Status: Downloaded newer image for jenkins/jenkins:2.146
JeanneBrskysMBP:OracleCodeOne2018-HOL-Automating-Stack-Groovy nyjeanne$ docker pull sonarqube:7.1
7.1: Pulling from library/sonarqube
55cbf04beb70: Already exists 
1607093a898c: Already exists 
9a8ea045c926: Already exists 
d4eee24d4dac: Already exists 
c58988e753d7: Already exists 
794a04897db9: Already exists 
70fcfa476f73: Already exists 
806029475e0c: Already exists 
67959b355155: Already exists 
1e6b3af7f55a: Pull complete 
e0b67c57c8e1: Pull complete 
ce12e009fbe7: Pull complete 
3edf8e47f9c4: Pull complete 
Digest: sha256:4438a37735caa24d80da31ee29e72d686abdaa8f5009746ec60e0d43519e1a57
Status: Downloaded newer image for sonarqube:7.1

4 – The ability to run curl

If you are running Mac, Linux or Windows 10, you don’t need to do anything. If you are running an older version of Windows, you can install Cygwin.

5 – Optional: JDK

If you want to run groovy locally, JDK 8 (not higher) needs to be in your path. It is possible to do the lab without having Groovy installed.

6 – Optional: Groovy

Follow the instructions at: http://groovy-lang.org/install.html

Note: Please download Groovy 2.X rather than 3.X. Version 3.X is in alpha at the time of writing this lab.


At the command line, run groovy –version.(Small version differences are ok in the output)

$ groovy -version

Groovy Version: 2.5.2 JVM: 1.8.0_45 Vendor: Oracle Corporation OS: Mac OS X

4 – Disk space

This lab uses about 2 Gigabytes of disk space (not counting Docker itself.) The last step of the lab explains how to recover disk space.


At the command line, run curl https://www.oracle.com/code-one/index.html and ensure the output isn’t an error message.