Category Archives: Sys Admin

Material related to systems administration.

Install Docker Engine on Ubuntu

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Reading about how to Install Docker Engine on Ubuntu. I suppose it’s about time.

-------------------
Thu Nov 11 20:38:18 [bash:5.0.17 jobs:0 error:0]
root@tact:/home/jj5
# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
2db29710123e: Pull complete
Digest: sha256:cc15c5b292d8525effc0f89cb299f1804f3a725c8d05e158653a563f15e4f685
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

InfoWorld articles

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Today I discovered InfoWorld with these articles:

And a bonus article from Spotify: How We Use Golden Paths to Solve Fragmentation in Our Software Ecosystem .
Also, I should note, I very much like the InfoWorld URL format: https://www.infoworld.com/article/3614850/no-one-wants-to-manage-kubernetes-anymore.html — this is the same URL structure I use in my own designs.

dovecot IMAP not working on iOS because of Let’s Encrypt certificate problem

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So I was having an issue with the mail app in my iPhones not being able to get IMAP email from my dovecot server.
Turned out I needed to change my dovecot config from this:

ssl_key = </etc/dovecot/mail.{{ domain }}.key
ssl_cert = </etc/dovecot/mail.{{ domain }}.crt
ssl_ca = </etc/dovecot/mail.{{ domain }}.chain.pem

to this:

ssl_key = </etc/dovecot/mail.{{ domain }}.key
ssl_cert = </etc/dovecot/mail.{{ domain }}.chain.pem