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Linux High Availability on IBM z SystemsAn Overview
Berthold GunrebenBuild Service Engineer
SUSE
Kristoffer GronlundHigh Availability Engineer
SUSE
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Outline
• Highly Available Hardware
• Introduction to High Availability
• Demo
Mainframe
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The Mainframe as a Datacenter
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Internals
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Key points
• Always virtualized
• Meet top level RAS Criteria
• Highest IO throughput
• Scale with number of CPUs
• No internal disk storage
SUSE Linux Enterprise High Availability Extension
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High Availability
• Continuous Availability (CA)‒ No planned or unplanned outages
• Continuous Operations (CO)‒ Hides planned outages from users
• High Availability (HA)‒ Hides unplanned (and planned) outages from users
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Terminology
• Node‒ Member of a cluster
• Resource‒ Anything managed by the cluster
• Constraints‒ Rules determining where and how resources are allocated
• CIB‒ Cluster Information Base
‒ Shared knowledge of resources and constraints
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Architecture
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STONITH
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Basic requirements
• Nodes‒ At least two
• Network‒ Reliable
• STONITH‒ SBD needs shared storage, watchdog
‒ Other means: IPMI, iLO, ...
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Mainframe as High Availability Platform
• Requirements can be provided virtualized as needed‒ Network
‒ Storage
‒ Nodes
‒ STONITH
‒ SSI, User vs. Identity
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Availability of the Extension
• Included with SUSE Linux Enterprise Server for System z
• Also available for x64
Preparation
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Node DeploymentSetting up VMs
• Two or more nodes
• Operating System prepared as KIWI virtual appliance‒ Include all needed Packages
‒ Setup update channels
‒ Network configuration done during first bootup
‒ Prepare for usage as a Node in the HA Cluster
• Shared disk for SBD
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Node DeploymentKIWI
• Clone of KIWI as described in “The Virtualization Cookbook for IBM z Systems Volume 3”, SG24-8890
• Details and instructions for KIWI are found at‒ http://opensuse.github.io/kiwi/
‒ https://en.opensuse.org/SDB:KIWI_Cookbook_Start_Cooking
‒ https://doc.opensuse.org/projects/kiwi/doc/
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Node DeploymentBasic configuration, prepared with KIWI
• Network setup
• HOSTNAME
• /etc/hosts
‒ Needed by cluster software
• Configure NTP
• Enable watchdog‒ Use vmwatchdog on z Systems
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Node DeploymentCluster Installation, first node
• ha-cluster-init
‒ Ensures needed software is installed
‒ Configures cluster SSH identity
‒ Installs SBD
‒ Configures basic CIB
‒ Configures csync2
‒ Installs hawk
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Node DeploymentCluster Installation, other nodes
• ha-cluster-join -c <node>
‒ Any cluster node as argument
Live Demo
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Demo software
• HAProxy‒ HTTP(S) load balancing
• Apache‒ Basic web application
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Apache Configuration
• sed -i 's/^Listen 80$/Listen 8000/g' /etc/apache2/listen.conf
• copy index.html to /srv/www/htdocs/index.html
<!doctype html><html> <head> <title>Cluster web server test</title> </head> <body> <h1>Cluster web server test</h1> <p>This is node [hostname]. </p> </body></html>
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HAProxy Configuration
• /etc/haproxy/haproxy.cfg
global maxconn 256 daemon
defaults mode http timeout connect 5000ms timeout client 50000ms timeout server 50000ms
listen http-in bind <floating-ip>:80 server server1 <node1>:8000 server server2 <node2>:8000 stats enable
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Cluster configuration
• crm configure edit
rsc_template web-server apache port=8000 \op monitor interval=10s
primitive proxy systemd:haproxy \op monitor interval=10s
primitive proxy-vip ocf:heartbeat:IPaddr2 ip=<floating-ip>primitive server-1 @web-serverprimitive server-2 @web-servergroup g-proxy proxy-vip proxy# Never put the two web servers on the same nodecolocation co-serv -inf: server-1 server-2
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Verifying setupHAProxy
• HAProxy stats‒ http://<floating-ip>/haproxy?stats
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MonitoringHawk
• Live Status
• Dashboard
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Handling failureDemo
• Software failure‒ HAProxy crashing
‒ Apache crashing
• “Hardware” failure‒ Fail over
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Adding nodes
• Automatically balances resources across new nodes
• Up to 32 nodes
Q&A
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More Information
• Virtualization Cookbook• https://www.suse.com/documentation/sle_ha/book_sleha/data/book_sleha.html
• https://www.suse.com/documentation/sle-ha-12/
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More Linux on Mainframe @SUSECon
• CAS19992 - What´s Old is New Again: Consolidation and Innovation with Linux on the Mainframe at Sparda DV
• BOV19372 - KVM and Linux on z Systems
• BOV19919 - SUSE Manager on z Systems
• BOV19995 - 15 Years of SUSE Linux Enterprise Server on the Mainframe: Control, Optimize, Innovate!
• TUT19877 - Linux and z Systems in the Datacenter
• TUT20511 - SUSE Linux Enterprise Server on IBM z Systems, the Highly Scalable Hub for Mobile Workloads in the Enterprise
• FUT20719 - SUSE Linux Enterprise Server for System z Roadmap: Building enterprise IT with SUSE Linux Enterprise on IBM Mainframes
Thank you.
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Questions?
Learn more:www.suse.com/products/systemz/https://www.suse.com/products/highavailability/
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