[Bug 1752705] Re: installation of mysql-server fails because postinst fails to shut down server

[ChristianEhrhardt]

ubuntu at b-test:~$ sudo systemd-nspawn -D testmysql --bind /etc/resolv.conf /bin/bash
Spawning container testmysql on /home/ubuntu/testmysql.
Press ^] three times within 1s to kill container.
Host and machine ids are equal (92544cb0ba5946158c7c4f9b57691fe3): refusing to link journals
bash: cannot set terminal process group (-1): Inappropriate ioctl for device
bash: no job control in this shell

Ok, in there with a shell

Ok, it takes a long time but works:
Setting up mysql-server-5.7 (5.7.21-1ubuntu1) ...
invoke-rc.d: could not determine current runlevel
 * Stopping MySQL database server mysqld                                                                                                   [ OK ] 
update-alternatives: using /etc/mysql/mysql.cnf to provide /etc/mysql/my.cnf (my.cnf) in auto mode
Renaming removed key_buffer and myisam-recover options (if present)
Created symlink /etc/systemd/system/multi-user.target.wants/mysql.service → /lib/systemd/system/mysql.service.
invoke-rc.d: could not determine current runlevel

So this likely needs debug on your system why it fails for you.
Adding systemd task for being nspawn related.

** Also affects: systemd (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1752705

Title:
  installation of mysql-server fails because postinst fails to shut down
  server

Status in mysql-5.7 package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  Creating a fresh Bionic directory with `debootstrap` and then
  attempting to install `mysql-server` inside a `systemd-nspawn`
  container fails with the following message:

  Setting up mysql-server-5.7 (5.7.21-1ubuntu1) ...
  invoke-rc.d: could not determine current runlevel
   * Stopping MySQL database server mysqld                                 [ OK ]
  update-alternatives: using /etc/mysql/mysql.cnf to provide /etc/mysql/my.cnf (my.cnf) in auto mode
  Renaming removed key_buffer and myisam-recover options (if present)
  Error: Unable to shut down server with process id 532
  dpkg: error processing package mysql-server-5.7 (--configure):
   installed mysql-server-5.7 package post-installation script subprocess returned error exit status 1

  
  Steps to reproduce:
  1. debootstrap bionic testmysql
  2. rm testmysql/etc/resolv.conf
  2. systemd-nspawn -D testmyql --bind /etc/resolv.conf /bin/bash -c 'apt update && apt install mysql-server'

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