Christopher Juckins

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centos_7_migration_notes

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centos_7_migration_notes [2022/05/18 13:31] – juckinscentos_7_migration_notes [2023/12/14 10:10] – juckins
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 RHEL5/6/7 Cheatsheet: {{:rhel_5_6_7_cheatsheet_201410.pdf|}} RHEL5/6/7 Cheatsheet: {{:rhel_5_6_7_cheatsheet_201410.pdf|}}
 +
 +[[https://tuxcare.com/extended-lifecycle-support/ Tuxcare's CentOS 7 Extended Support]]
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 +
 +14 Dec 2023 (for Dell XPS 8930 tower):
 +  * Updated kernel from kernel-3.10.0-1160.102.1.el7.x86_64 to kernel-3.10.0-1160.105.1.el7.x86_64
 +  * Attempted to rebooted machine but after the BIOS splash screen, only got a blank screen with blinking cursor in upper-left corner 
 +  * Restarted machine using the power button but had same condition
 +  * Restarted once again but at the BIOS splash screen selected F12
 +  * For boot options, chose Boot from Hard Drive and list of kernels appeared
 +  * Chose latest kernel and machine was OK
 +  * After machine was running, did another restart and machine powered up with no issues
 +
 +23 Oct 2023 (for Dell XPS 8930 tower)
 +  * Updated kernel from kernel-3.10.0-1160.99.1.el7.x86_64 to kernel-3.10.0-1160.102.1.el7.x86_64 and then machine would not boot, just blank screen with blinking cursor in upper-left corner
 +  * Powered off machine, unplugged the USB peripheral cables
 +  * Unplugged power cable for 30 seconds
 +  * Rebooted and used F12 to go into BIOS Boot Options
 +  * Tried to boot to Hard Drive but that immediately failed with error 'press any key to reboot'
 +  * After that, the machine booted up OK and the normal selection of kernels appeared
  
 Other fixes: Other fixes:
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   * See https://mariadb.com/kb/en/configuring-mariadb-for-optimal-performance/   * See https://mariadb.com/kb/en/configuring-mariadb-for-optimal-performance/
   * Also check python3 coding best practices for opening/closing database connections   * Also check python3 coding best practices for opening/closing database connections
 +    * I have noted that opening and closing the database connection only once in the python script helps reduce database "cannot assign requested address" errors
   * [[https://pypi.org/project/mysqlclient/|mysqlclient]] is supposedly [[https://stackoverflow.com/questions/43102442/whats-the-difference-between-mysqldb-mysqlclient-and-mysql-connector-python|faster than alternatives]]   * [[https://pypi.org/project/mysqlclient/|mysqlclient]] is supposedly [[https://stackoverflow.com/questions/43102442/whats-the-difference-between-mysqldb-mysqlclient-and-mysql-connector-python|faster than alternatives]]
       * import MySQLdb       * import MySQLdb
centos_7_migration_notes.txt · Last modified: 2023/12/14 10:10 by juckins