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How to Fix MySQL port 3306 already in use Error / Another instance already running
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[Impact]
When a user attepts to install mysql-server to their system, there is a chance that it will fail due to a race condition in the post-install script.
In this situation, the user will be provided with the error:
dpkg: error processing package mysql-server-8.0 (--configure):
installed mysql-server-8.0 package post-installation script subprocess returned error exit status 1
The only way to fix this is to uninstall then retry the install again.
The provided fix resolves the race condition by making sure mysql is shut down completely after setup before it boots back up again for use by the user.
[Test Plan]
Since this is a race condition, it can take a while to reproduce. However, using less cores and lower CPU speeds makes it appear more often. Testing with the following code many times will eventually show that, prior to the update, this issue appears. Meanwhile after the update it does not.
# lxc launch
images:ubuntu/[kinetic, jammy, impish, focal] test-mysql
# lxc exec test-mysql bash
# apt update && apt dist-upgrade -y
# apt install mysql-server
[Where problems could occur]
Since this update has the postinst script enforce shutdown after configuration, mysql may be cut off abruptly, which could cause internal problems that it may need to address on the following startup.
[Other Info]
The fix was released to kinetic in 8.0.29-0ubuntu4
[Original Description]
mysql server not running
ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: mysql-server-8.0 8.0.23-0ubuntu0.20.04.1
ProcVersionSignature: Ubuntu 5.8.0-48.54~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-48-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
Date: Thu Mar 25 15:33:48 2021
ErrorMessage: installed mysql-server-8.0
package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2021-03-24 (0 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
Logs.var.log.daemon.log:
MySQLConf.etc.mysql.conf.d.mysql.cnf: [mysql]
MySQLConf.etc.mysql.conf.d.mysqldump.cnf:
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
MySQLVarLibDirListing: ['#innodb_temp', 'ca-key.pem', 'binlog.000008', 'client-key.pem', 'server-key.pem', 'sys', 'binlog.000007', 'ibtmp1', 'server-cert.pem', 'binlog.000004', 'client-cert.pem', 'undo_002', 'binlog.000013', 'mysql', 'performance_schema', 'ib_logfile0', 'auto.cnf', 'binlog.000005', 'binlog.000002', 'ib_logfile1', 'debian-5.7.flag', 'binlog.000001', 'private_key.pem', 'binlog.000015', 'binlog.000011', 'ibdata1', 'ca.pem', 'binlog.000009', 'binlog.index',
'public_key.pem', 'binlog.000003', 'ib_buffer_pool', 'binlog.000014', 'binlog.000016', '#ib_16384_0.dblwr', 'binlog.000006', 'mysql.ibd', '#ib_16384_1.dblwr', 'binlog.000012', 'raghvendra-HP-EliteBook-Folio-9470m.pid', 'undo_001', 'binlog.000010']
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-5.8.0-48-generic root=UUID=7d0f25d1-2e3e-4c9a-aabc-c337c6b1278b ro quiet splash vt.handoff=7
Python3Details: /usr/bin/python3.8, Python
3.8.5, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
dpkg 1.19.7ubuntu3
apt 2.0.4
SourcePackage: mysql-8.0
Title: package mysql-server-8.0 8.0.23-0ubuntu0.20.04.1 failed to install/upgrade: installed mysql-server-8.0 package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)