How to Keep Critical Applications up and running 24x7 Linda Wang - - PowerPoint PPT Presentation

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How to Keep Critical Applications up and running 24x7 Linda Wang - - PowerPoint PPT Presentation

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How to Keep Critical Applications up and running 24x7 Linda Wang Red Hat, Inc. October 6, 2016 1 LinuxConf Europe 2016 - How to keep application up 24x7 Background Computer industry has been evolving Decades of improvement

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“How to Keep Critical Applications up and running 24x7”

Linda Wang Red Hat, Inc. October 6, 2016

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Background

  • Computer industry has been evolving
  • Decades of improvement
  • Various OS's claimed to be able to achieve Zero down

time for their users, through various of individual mechanisms..

  • System monitoring
  • Predictive Self Healing
  • Without indepth analysis the fundamental causes of

down time, do these features really help?

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Today

  • Open Source community
  • Ease of access to source
  • Linux - lot of research and development in research

institutes

  • Opens doors and paths to different approaches and allows

experimentation

  • Advanced Kernel development
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How to Achieve 24x7 Uptime

  • Analysis the reasons behind down time
  • Planned vs Unplanned
  • With unplanned, we want to proactively avoid it
  • Predictable vs Unpredictable
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How to achieve 24x7 Uptime

  • Reasons behind Down Times
  • Two types of Down-Time: unplanned vs. planned
  • Unplanned: predictable, unpredictable

Unpredictable/ Unplanned Predictable/ Planned Proactive Planning Application Crash Operating System Panic Hardware Failure

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24x7 Uptime

  • Reasons behind Down Times
  • Two types of Down-Time: unplanned vs. planned
  • Unplanned: predictable, unpredictable;

Unpredictable/ Unplanned Predictable/ Planned Proactive Planning Application Crash * Diag. - (gdb) * Auto restart - (systemd ufile) Operating System Panic * Diagnostic tool (kdump/crash) * Auto restart (NMI timeout) Hardware Failure * Error detection (HERM)

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24x7 Uptime

  • Reasons behind Down Times
  • Two types of Down-Time: unplanned vs. planned
  • Unplanned: predictable, unpredictable;

Unpredictable/ Unplanned Predictable/ Planned Proactive Planning Application Crash * Diag. - (gdb) * Auto restart - (systemd ufile) * Security updates Operating System Panic * Diagnostic tool (kdump/crash) * Auto restart (NMI timeout) Hardware Failure * Error detection (HERM)

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24x7 Uptime

  • Reasons behind Down Times
  • Two types of Down Time: unplanned vs. planned
  • Unplanned: predictable, unpredictable;

Unpredictable/ Unplanned Predictable/ Planned Proactive Planning Application Crash * Diag. - (gdb) * Auto restart - (systemd ufile) * Security updates Operating System Panic * Diagnostic tool (kdump/crash) * Auto restart (NMI timeout) * Kernel security, bugfix updates Hardware Failure * Error detection (HERM)

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24x7 Uptime

  • Reasons behind Down Times
  • Two types of Down Time: unplanned vs. planned
  • Unplanned: predictable, unpredictable;

Unpredictable/ Unplanned Predictable/ Planned Proactive Planning Application Crash * Diag. - (gdb) * Auto restart - (systemd ufile) * Security updates Operating System Panic * Diagnostic tool (kdump/crash) * Auto restart (NMI timeout) * Kernel security, bugfix updates Hardware Failure * Error detection (HERM) * Hardware replacement

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24x7 Uptime

  • Reasons behind Down Times
  • Two types of Down Time: unplanned vs. planned
  • Unplanned: predictable, unpredictable;

Unpredictable/ Unplanned Predictable/ Planned Proactive Planning Application Crash * Diag. - (gdb) * Auto restart - (systemd ufile) * Security updates * Live patching security fixes (systemtap) Operating System Panic * Diagnostic tool (kdump/crash) * Auto restart (NMI timeout) * Kernel security, bugfix updates Hardware Failure * Error detection (HERM) * Hardware replacement

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24x7 Uptime

  • Reasons behind Down Times
  • Two types of Down Time: unplanned vs. planned
  • Unplanned: predictable, unpredictable;

Unpredictable/ Unplanned Predictable/ Planned Proactive Planning Application Crash * Diag. - (gdb) * Auto restart - (systemd ufile) * Security updates * Live patching security fixes (systemtap) Operating System Panic * Diagnostic tool (kdump/crash) * Auto restart (NMI timeout) * Kernel security, bugfix updates * Live patching known kernel issues (kpatch) Hardware Failure * Error detection (HERM) * Hardware replacement

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24x7 Uptime

  • Reasons behind Down Times
  • Two types of Down Time: unplanned vs. planned
  • Unplanned: predictable, unpredictable

Unplanned Down Time Planned Down Time Proactive Planning Application Crash * Diag. - (gdb) * Auto restart - (systemd ufile) * Security updates * Live patching security fixes (systemtap) Operating System Panic * Diagnostic tool (kdump/crash) * Auto restart (NMI timeout) * Kernel security, bugfix updates * Live patching known kernel issues (kpatch) Hardware Failure * Error detection (HERM) * Hardware replacement *Checkpoint/R estore (criu)

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Prepare for DownTime Scenarios

  • Preventive Measures
  • For security fixes and known issues to avoid crashes
  • Live Patches - for both kernel and userspace
  • To avoid Down Times due to Hardware Failure or

Regular Maintenance

  • Containerize critical applications, and use Live

Migration to move to alternative systems while

  • riginal systems under-going maintenance to avoid

down time

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Kernel Live Patching Enhancements

  • Demo
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Use Space Live Patching

  • Demo
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Container Migration

  • Demo
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For more information...

Kernel Live Patching: ■ http://rhelblog.redhat.com/?s=live+patching ■ questions: kpatch@redhat.com

  • Checkpoint Restore/Live Migration:

■ http://rhelblog.redhat.com/?s=criu ■ questions: criu@redhat.com

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Thank-you!