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• 

  Mads Madsen 19:06 on October 13, 2024 Permalink | Reply
  Tags: Debian ( 5 ), mdadm, Software RAID, Ubuntu   

  Join already setup software raid 

  When moving disks from one host to another, I wanted to join the raid already setup on the disks.

  On the new host ensure mdadm is already installed.

  $ sudo apt-get install mdadm

  Scan for the raid:

  $ sudo mdadm --detail --scan

  Check that it was found successfully.

  Persist the found raid in /etc/mdadm/mdadm.conf:

  $ sudo mdadm --detail --scan >> /etc/mdadm/mdadm.conf

  Update initramfs:

  $ sudo update-initramfs -u

  Add the raid to /etc/fstab so it’ll be mounted on boot:

  /dev/md0 /mnt/md0 ext4 defaults,nofail,discard 0 0

   

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• 

  Mads Madsen 10:29 on November 12, 2020 Permalink | Reply
  Tags: aws, docker   

  Run aws lambda locally 

  Create simple Dockerfile:

  FROM lambci/lambda:build-nodejs12.x COPY . . RUN curl -o- -L https://yarnpkg.com/install.sh | bash RUN $HOME/.yarn/bin/yarn USER sbx_user1051 ENTRYPOINT ["/var/rapid/init", "--bootstrap", "/var/runtime/bootstrap", "--enable-msg-logs"]

  1 2 3 4 5 6

  FROM lambci/lambda:build-nodejs12.x COPY . . RUN curl -o- -L https://yarnpkg.com/install.sh | bash RUN $HOME/.yarn/bin/yarn USER sbx_user1051 ENTRYPOINT ["/var/rapid/init", "--bootstrap", "/var/runtime/bootstrap", "--enable-msg-logs"]

  The above Dockerfile is for nodejs lambdas, check https://github.com/lambci/docker-lambda for more docker images.

  Build the above docker image:

  $ docker build -t image-name .

  1	$ docker build -t image-name .

  Run the docker image:

  $ docker run --rm --env-file someenvfile.env -p 9001:9001 -v "$PWD":/var/task:ro,delegated image-name lambda.handle

  1	$ docker run --rm --env-file someenvfile.env -p 9001:9001 -v "$PWD":/var/task:ro,delegated image-name lambda.handle

   
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  Mads Madsen 10:42 on September 10, 2020 Permalink | Reply
  Tags: bash, environment, export   

  Export environment variables without exposing them to command history 

  Environment file example:

  SOME_USERNAME=username SOME_PASSWORD=password

  1 2	SOME_USERNAME=username SOME_PASSWORD=password

  Export command:

  $ export $(cat envfile.env | grep -v -E '#' | xargs)

  1	$ export $(cat envfile.env | grep -v -E '#' | xargs)

   
• 

  Mads Madsen 18:51 on April 7, 2019 Permalink | Reply
  Tags: homebrew ( 3 ), Mac OS X ( 2 )   

  Permission denied (publickey). fatal: Could not read from remote repository. 

  > brew update Permission denied (publickey). fatal: Could not read from remote repository.

  1 2 3

  > brew update                                                                                                                                                                                                             Permission denied (publickey). fatal: Could not read from remote repository.

  On mac os, fix:

  > ssh-add -A

  1	> ssh-add -A

   
• 

  Mads Madsen 13:16 on April 6, 2019 Permalink | Reply
  Tags: homebrew ( 3 )   

  Git Error: Could could not read Username for ‘https://github.com’: terminal prompts disabled 

  If you have enabled 2FA on github, you can no longer use https:// in the terminal, run the command below, to always force ssh when trying to access github from the terminal.

  git config --global --add url."git@github.com:".insteadOf "https://github.com/"

  1	git config --global --add url."git@github.com:".insteadOf "https://github.com/"

   
• 

  Mads Madsen 13:30 on February 16, 2019 Permalink | Reply
  Tags: Debian ( 5 ), Pi zero, Raspberry PI   

  Rename default pi user 

  After installing Raspbian Lite on a Raspberry PI, the default user pi is a liability. To fix this, a possibility is to create a new user and delete the old pi user, but I like recycling, so I’ll just rename the user.

  First we need to allow root login over ssh;

  1. Add PermitRootLogin yes to /etc/ssh/sshd_config
  2. Change the password of the root user $ sudo passwd root
  3. Restart ssh $ sudo service ssh restart

  Second login to the raspberry with root and execute the following;

  1. Kill all processes started by pi
     1. $ pkill -u pi
     2. $ pkill -9 -u pi
  2. $ usermod -l new_username pi
  3. $ groupmod -n new_username pi
  4. $ usermod -d /home/new_username new_username
  5. Remove PermitRootLogin yes from /etc/ssh/sshd_config
  6. Remove the root password $ passwd -d root
  7. Restart the raspberry pi $ reboot

   
• 

  Mads Madsen 01:44 on June 18, 2017 Permalink | Reply
  Tags: Debian ( 5 ), rsyslog   

  Make rsyslog log a specific program into its own log file and stop logging into syslog 

  /etc/rsyslog.d/kubelet.conf

  Shell

  if $programname == 'kubelet' then /var/log/kubelet.log if $programname == 'kubelet' then stop

  1 2	if $programname == 'kubelet' then /var/log/kubelet.log if $programname == 'kubelet' then stop

   
• 

  Mads Madsen 09:58 on June 15, 2017 Permalink | Reply
  Tags: npm, scope   

  Setup NPM to use a private registry for scoped packages 

  localhost:4873 to serve @scoped packages

  npm config set @scoped:registry=http://localhost:4873/

  1	npm config set @scoped:registry=http://localhost:4873/

   

   
• 

  Mads Madsen 11:34 on October 23, 2014 Permalink | Reply
  Tags: Python ( 2 )   

  Get Last Day of the Month in Python 

  Python

  >>> import calendar >>> calendar.monthrange(2002,1) (1, 31) >>> calendar.monthrange(2008,2) (4, 29) >>> calendar.monthrange(2100,2) (0, 28)

  1 2 3 4 5 6 7

  >>> import calendar >>> calendar.monthrange(2002,1) (1, 31) >>> calendar.monthrange(2008,2) (4, 29) >>> calendar.monthrange(2100,2) (0, 28)

   
• 

  Mads Madsen 17:07 on March 26, 2014 Permalink | Reply
  Tags: android, disable 2g, force 3g, force 4g, kitkat   

  Force 3G or 4G Android Kitkat 4.4 

  In the dialer type in *#*#4636#*#*.

  Go to Phone information and scroll down to ‘Set preferred network type’ and set it to ‘LTE/CDMA’.
  And now your phone will not try to connect to EDGE/2G.

  Note this mode completely disables GSM/EDGE/2G so when the phone is out of reach from a 3G tower, you will not be able to make phone calls. In this case just switch back to a GSM mode.