Macbook delete fingerprint information

Apple fingerprint information clear

If you want to return, repair or sell your Apple device. Then you should make sure that all data is deleted. This way the fingerprint information should also be deleted.

Clear Touch Bar information

To delete the fingerprint information, the Apple device must be set to Recorvery mode and open the Terminal.

  1. Restart
  2. Hold down Command-R
  3. Utilities -> Terminal
xartutil –erase-all

You get the question if you are sure, you have to confirm this with “yes” and press Return.

Checking

After rebooting, you can easily check the settings to see if it worked.

no fingerprint

git commit forget Signed-off-by

If you forget to set “Signed-off-by” in the commit. This is now problem, you can still do it afterwards.

To sign-off the last two commits:

git filter-branch --msg-filter "cat - && echo && echo 'Signed-off-by: Your Name '" HEAD~2..HEAD

Then force to push them to the remote repo with the -f option:

git push -f

macOS Sierra – [warn] kq_init: detected broken kqueue; not using.: Undefined error: 0

If you have problems, when you update to macOS Sierra and receive this message:

[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0

Reinstall with brew libevent package:

brew reinstall libevent
==> Reinstalling libevent
==> Downloading https://homebrew.bintray.com/bottles/libevent-2.0.22.sierra.bottle.1.tar.gz
######################################################################## 100,0%
==> Pouring libevent-2.0.22.sierra.bottle.1.tar.gz
🍺  /usr/local/Cellar/libevent/2.0.22: 734 files, 2.0M

Vagrant 1.8.5 – public key problem

If you like to create with kitchen a new Vagrant instance with the Vagrant version 1.8.5 you get the following problem:

           default: Vagrant insecure key detected. Vagrant will automatically replace
           default: this with a newly generated keypair for better security.
           default:
           default: Inserting generated public key within guest...
           default: Removing insecure key from the guest if it's present...
           default: Key inserted! Disconnecting and reconnecting using new SSH key...
           default: Warning: Authentication failure. Retrying...
           default: Warning: Authentication failure. Retrying...
           default: Warning: Authentication failure. Retrying...
           default: Warning: Authentication failure. Retrying...
           default: Warning: Authentication failure. Retrying...
           default: Warning: Authentication failure. Retrying...
           default: Warning: Authentication failure. Retrying...
           default: Warning: Authentication failure. Retrying...

To fix this, you should create this file:

vi .vagrant.d/Vagrantfile

With the content:

Vagrant.configure("2") do |config|
  config.ssh.insert_key = false
end

rsync status with lsof

To see the status from rsync, you can use lsof:

lsof -ad3-999 -c rsync

Output:

COMMAND  PID USER   FD   TYPE             DEVICE SIZE/OFF       NODE NAME
rsync   8097 root    3r   REG             252,17   404832 7559983121 /srv/data/safematix
rsync   8097 root    4u  unix 0xffff8806f4447080      0t0      85225 type=STREAM
rsync   8097 root    5u  unix 0xffff8806f4444ec0      0t0      85226 type=STREAM
rsync   8098 root    3u  unix 0xffff880738502580      0t0      77431 type=STREAM
rsync   8099 root    4u  unix 0xffff880738500b40      0t0      77432 type=STREAM

Move logical Volumes to other volume group and remove the physical volume.

At the beginning, it look like:

~# lvs
  LV         VG         Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  log        system     -wi-ao----  1.86g
  root       system     -wi-ao----  2.79g
  swap       system     -wi-ao----  1.86g
  tmp        system     -wi-ao----  1.86g
  usr        system     -wi-ao----  1.86g
  var        system     -wi-ao---- 31.72g
  testlv     systemtest -wi-------  5.00g
  testlv2    systemtest -wi------- 20.00g
~# pvs
  PV         VG         Fmt  Attr PSize   PFree
  /dev/md0   systemtest lvm2 a--  884.63g 859.63g
  /dev/sdk3  system     lvm2 a--  147.61g 105.66g

Now we begin to merge the two volume groups to one.

vgsplit -n systemtest/testlv systemtest system

Now it look like:

~# pvs
  PV         VG     Fmt  Attr PSize   PFree
  /dev/md0   system lvm2 a--  884.63g 859.63g
  /dev/sdk3  system lvm2 a--  147.61g 105.66g
~# lvs
  LV         VG         Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  log        system     -wi-ao----  1.86g
  root       system     -wi-ao----  2.79g
  swap       system     -wi-ao----  1.86g
  tmp        system     -wi-ao----  1.86g
  usr        system     -wi-ao----  1.86g
  var        system     -wi-ao---- 31.72g
  testlv     system     -wi-------  5.00g
  testlv2    system     -wi------- 20.00g

Now we want to remove md0, but before we must move the data to the other physical volume.

~# pvmove /dev/md0
  /dev/md0: Moved: 0.0%
  /dev/md0: Moved: 5.5%
  /dev/md0: Moved: 10.6%
  /dev/md0: Moved: 14.1%
  /dev/md0: Moved: 17.6%
  /dev/md0: Moved: 21.8%
  /dev/md0: Moved: 25.3%
  /dev/md0: Moved: 28.9%
  /dev/md0: Moved: 32.4%
  /dev/md0: Moved: 36.2%
  /dev/md0: Moved: 39.8%
  /dev/md0: Moved: 43.6%
  /dev/md0: Moved: 47.4%
  /dev/md0: Moved: 50.7%
  /dev/md0: Moved: 54.6%
  /dev/md0: Moved: 58.1%
  /dev/md0: Moved: 62.0%
  /dev/md0: Moved: 65.9%
  /dev/md0: Moved: 69.1%
  /dev/md0: Moved: 72.9%
  /dev/md0: Moved: 76.9%
  /dev/md0: Moved: 80.0%
  /dev/md0: Moved: 83.7%
  /dev/md0: Moved: 87.2%
  /dev/md0: Moved: 90.8%
  /dev/md0: Moved: 95.0%
  /dev/md0: Moved: 98.6%
  /dev/md0: Moved: 100.0%

Now we can remove the md0 from the system volume group.

~# vgreduce system /dev/md0
  Removed "/dev/md0" from volume group "system"

lxd shared directory

To share the data to a LXD container, you must set the UID and GID to 100000. In the container it will be the id from root (0).

chown -R 100000:100000 /srv/shared

Now you can connect the shared folder:

lxc config device add mycontainer shared disk path=/srv/shared source=/srv/shared

gem mirror – gemirro

Gemirro is a Ruby application that makes it easy way to create your own RubyGems mirror without having to push or write all gem you wanted in a configuration file. It does mirroring without any authentication and you can add your private gems in the gems directory. More, to mirroring a source, you only need to start the server, and gems will automaticly be downloaded when needed.

Gemirro will start on port 2000. I should proxy it via nginx.

Install the gem gemirro:

gem install gemirro

Create your mirror:

gemirro init /srv/mirror/gems/

Create a gemirro index:

gemirro index

Start the server:

gemirro server --start

Show the status:

gemirro server --status

Stop the server:

gemirro server --stop

Start the server with a http/s proxy:

https_proxy="https://proxy.safematix.com:8080" gemirro server --start

Github gemirro

Linux, BSD, Unix and Security tips