Lots of new articles

- Teams video background on linux
- View Outlook calendar in tmux/terminal
- Jenkins notes
- List all configured Jenkins passwords
- Resize Linux disks
- How to create a redis cluster
- My Linux desktop journey
- People that have inspired me (WIP)

Author: skybert

conf/pelicanconf.py

@@ -4,7 +4,7 @@
 
 AUTHOR = 'Torstein Krause Johansen'
 SITENAME = "Skybert's World"
-SITEURL = 'http://skybert.net'
+SITEURL = 'https://skybert.net'
 TIMEZONE = 'Europe/Oslo'
 DEFAULT_LANG = 'en'
 

src/graphics/2021/2021-10-07-teams-with-wallpaper.jpg

@@ -1,7 +1,7 @@
 title: List All Configured Passwords and Secrets in Jenkins
 date: 2021-10-08
 category: java
-tags: java, security
+tags: java, security, jenkins
 
 
 Sometimes, like when you want to migrate an old Jenkins to a new one

src/graphics/2021/outlook-in-tmux.png

@@ -0,0 +1,66 @@
+title: MS Teams Wallpaper on Linux
+date: 2021-10-06
+category: linux
+tags: linux, video
+
+My only envy of Mac and Windows users has been video backgrounds in
+[Microsoft
+Teams](https://www.microsoft.com/nb-no/microsoft-teams/). Not any
+more, thanks to [backscrub](https://github.com/floe/backscrub).
+
+<a href="/graphics/2021/2021-10-07-teams-with-wallpaper.jpg">
+  <img
+    class="centered"
+    src="/graphics/2021/2021-10-07-teams-with-wallpaper.jpg"
+    alt="teams with wallpaper"
+    style="width: 1024px"
+  />
+</a>  
+
+You'll need to compile it yourself (which will also compile
+Tensorflow).
+
+```bash
+$ git clone https://github.com/floe/backscrub.git
+$ mkdir build
+$ cd build
+$ cmake .. && make -j$(nproc)
+```
+
+Then, load the kernel module:
+
+```text
+# modprobe v4l2loopback \
+  devices=1 \
+  max_buffers=2 \
+  exclusive_caps=1 \
+  card_label="VirtualCam" \
+  video_nr=10
+```
+
+You'll then be able to choose your background with:
+
+```bash
+$ ./build/backscrub \
+      -c /dev/video0 \
+      -v /dev/video10 \
+      -b ~/pictures/wallpapers/foo.jpg
+```
+
+In Chrome/Teams/Skype++ you'll then choose `/dev/video10`, which will
+show up as `VirtualCam` because of the `card_label` option to
+`modprobe` above, instead of `/dev/video0` as the camera input. That's
+it.
+
+...well, there is actually another thing you must do: Currently
+(2021-10-06), the `eigen` library is down on Gitlab, so before running
+`cmake`, you'll have to do:
+
+```bash
+$ find -type f | 
+  while read -r f ; do 
+    sed 's#https://gitlab.com/libeigen/eigen#https://gitlab.com/libeigen/eigen-backup#g' "$f"; 
+  done
+```
+    
+Thanks to `backscrub`, I no longer have a thing I miss on Linux ;-)

src/java/jenkins.md

@@ -0,0 +1,78 @@
+title: Outlook in tmux
+date: 2021-11-04
+category: linux
+tags: linux
+
+<a href="/graphics/2021/outlook-in-tmux.png">
+  <img
+    class="centered"
+    src="/graphics/2021/outlook-in-tmux.png"
+    alt="outlook in tmux"
+    style="width: 1024px;"
+  />
+</a>
+
+Here you see [tmux](https://github.com/tmux/tmux) running showing a
+summary of my Outlook agenda. There's also some other nice things that
+I like to keep track of, like the time and battery usage.
+
+To get this working, I have done a few things:
+
+## Exporting Outlook calendar as ical
+
+I've gotten a hold of the [.ics
+URL](https://fileinfo.com/extension/ics) of my Outlook calendar.
+
+## cron job to convert ical to Org
+Since I also want the calendar in Emacs, I convert it to
+[.org](https://orgmode.org/) using
+[ical2orgpy](https://github.com/asoroa/ical2org.py):
+
+```bash
+#! /usr/bin/env bash
+
+# pre-requisite: pip install ical2orgpy
+
+ics_url=https://outlook.office365.com/owa/calendar/[email protected]/235452314/calendar.ics
+org_file=$HOME/doc/scribbles/$(date +%Y)/outlook.org
+
+curl -s "${ics_url}" | ~/.local/bin/ical2orgpy - "${org_file}"
+```
+
+## Convert the ICS calendar export to something nice looking  
+
+I then convert the `outlook.org` into something that looks nice in the
+terminal:
+
+```bash
+#! /usr/bin/env bash
+
+sleep=3600
+
+create_nice_ascii_agenda() {
+    grep "$(date --iso)" -B 2 |
+    sed 's#:RECURRING:##' |
+    sed 's/-[ ]*$//' |                                # remove trailing dash and space
+    sed 's#\*#\n❯#g' |
+    sed '/^-$/d' |                                    # remove empty lines
+    sed "s#$(date +'%F %a') ##g" |                    # remove day abbreviation
+    sed 's#--# → #' |
+    xargs |                                           # remove all newlines
+    sed 's#❯#\n❯#g' |                                 # one entry per line
+    sed -r 's#❯ (.*) <(.*)> → <(.*)>#\2 → \3 ❯ \1#' | # put time first
+    sort -u |
+    cat
+}
+
+main() {
+  while true; do
+    clear
+    cat "$HOME/doc/scribbles/$(date +%Y)/outlook.org" |
+      create_nice_ascii_agenda
+    sleep "${sleep}"
+  done
+
+}
+
+main "$@"
+```

src/java/list-all-configured-passwords-and-secrets-in-jenkins.md

@@ -0,0 +1,109 @@
+title: Resizing a disk 
+date: 2021-11-11
+category: linux
+tags: linux
+
+
+First off, check the status of the `/` partition that we want to give
+more space:
+
+```text
+# df -h /
+Filesystem      Size  Used Avail Use% Mounted on
+/dev/sda4       144G   70G   67G  52% /
+```
+
+We've then expanded the disk on the hosting platform (Linode, AWS, KVM++) and want to make use of that extra space. For this, we use the partition tool GNU Parted: 
+
+
+```text
+# parted /dev/sda
+GNU Parted 3.2
+Using /dev/sda
+Welcome to GNU Parted! Type 'help' to view a list of commands.
+(parted) p
+Warning: Not all of the space available to /dev/sda appears to be used, you can fix the GPT to use all of the space (an extra 734003200 blocks) or continue with the current setting?
+Fix/Ignore? Fix
+Model: VMware Virtual disk (scsi)
+Disk /dev/sda: 537GB
+Sector size (logical/physical): 512B/512B
+Partition Table: gpt
+Disk Flags:
+
+Number  Start   End     Size    File system     Name  Flags
+ 1      1049kB  2097kB  1049kB                        bios_grub
+ 2      2097kB  1076MB  1074MB  ext4
+ 3      1076MB  3223MB  2147MB  linux-swap(v1)
+ 4      3223MB  161GB   158GB   ext4
+
+(parted) resizepart 4
+Warning: Partition /dev/sda4 is being used. Are you sure you want to continue?
+Yes/No? yes
+End?  [161GB]? 537GB
+```
+
+Now we can ask `parted` to print the new partition table to verify
+it's what we'd expect it to be:
+
+```text
+(parted) p
+Model: VMware Virtual disk (scsi)
+Disk /dev/sda: 537GB
+Sector size (logical/physical): 512B/512B
+Partition Table: gpt
+Disk Flags:
+
+Number  Start   End     Size    File system     Name  Flags
+ 1      1049kB  2097kB  1049kB                        bios_grub
+ 2      2097kB  1076MB  1074MB  ext4
+ 3      1076MB  3223MB  2147MB  linux-swap(v1)
+ 4      3223MB  537GB   534GB   ext4
+
+(parted) q
+Information: You may need to update /etc/fstab.
+```
+
+## Resize the file system to use the new space
+
+```text
+# df -h /
+Filesystem      Size  Used Avail Use% Mounted on
+/dev/sda4       144G   70G   67G  52% /
+```
+
+Then resize it:
+```text
+# resize2fs /dev/sda4
+resize2fs 1.44.1 (24-Mar-2018)
+Filesystem at /dev/sda4 is mounted on /; on-line resizing required
+old_desc_blocks = 19, new_desc_blocks = 63
+The filesystem on /dev/sda4 is now 130285051 (4k) blocks long.
+```
+
+Now, verify that the space is actually used as intended:
+```text
+# df -h /
+Filesystem      Size  Used Avail Use% Mounted on
+/dev/sda4       489G   70G  397G  15% /
+```
+
+Now that's a much larger disk!
+
+## Checking /etc/fstab
+
+```text
+# cat /etc/fstab
+UUID=86935d45-9ba5-11e8-877f-0050569be994 none swap sw 0 0
+UUID=87b2c106-9ba5-11e8-877f-0050569be994 / ext4 defaults 0 0
+UUID=86935d44-9ba5-11e8-877f-0050569be994 /boot ext4 defaults 0 0
+```
+
+Verify that the UUID of the `/` partition that we resized somehow hasn't changed:
+```text
+# blkid | grep sda4
+/dev/sda4: UUID="87b2c106-9ba5-11e8-877f-0050569be994" TYPE="ext4" PARTUUID="09fa4b97-c549-44d6-b498-a3117264b445"
+```
+
+As you can see, the `UUID` corresponds to what it's in `/etc/fstab`.
+
+

src/linux/ms-teams-wallpaper-on-linux.md

@@ -0,0 +1 @@
+/home/torstein/src/talks

src/linux/outlook-in-tmux.md

@@ -53,6 +53,11 @@ will create 3 masters and 3 replicas. This means Redis has _some_
 redundancy, but if both the master and its replica goes down, the
 other nodes will not be able to recover the data.
 
+If you download the Redis source code, you can find a [script that
+does all of this for
+you](https://github.com/redis/redis/blob/unstable/utils/create-cluster)
+(but what's the fun in that 😉).
+
 ## Writing data on one node and retrieving it from another
 
 ```bash