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53 lines
2.0 KiB
Plaintext
53 lines
2.0 KiB
Plaintext
// Module included in the following assemblies:
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//
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// * support/troubleshooting/troubleshooting-installations.adoc
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:_mod-docs-content-type: PROCEDURE
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[id="checking-load-balancer-configuration_{context}"]
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= Checking a load balancer configuration before {product-title} installation
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Check your load balancer configuration prior to starting an {product-title} installation.
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.Prerequisites
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* You have configured an external load balancer of your choosing, in preparation for an {product-title} installation. The following example is based on a {op-system-base-full} host using HAProxy to provide load balancing services to a cluster.
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* You have configured DNS in preparation for an {product-title} installation.
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* You have SSH access to your load balancer.
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.Procedure
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. Check that the `haproxy` systemd service is active:
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+
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[source,terminal]
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----
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$ ssh <user_name>@<load_balancer> systemctl status haproxy
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----
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. Verify that the load balancer is listening on the required ports. The following example references ports `80`, `443`, `6443`, and `22623`.
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+
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* For HAProxy instances running on {op-system-base-full} 6, verify port status by using the `netstat` command:
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[source,terminal]
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----
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$ ssh <user_name>@<load_balancer> netstat -nltupe | grep -E ':80|:443|:6443|:22623'
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----
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* For HAProxy instances running on {op-system-base-full} 7 or 8, verify port status by using the `ss` command:
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[source,terminal]
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----
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$ ssh <user_name>@<load_balancer> ss -nltupe | grep -E ':80|:443|:6443|:22623'
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----
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[NOTE]
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====
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Red Hat recommends the `ss` command instead of `netstat` in {op-system-base-full} 7 or later. `ss` is provided by the iproute package. For more information on the `ss` command, see the link:https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/performance_tuning_guide/sect-red_hat_enterprise_linux-performance_tuning_guide-tool_reference-ss[{op-system-base-full} 7 Performance Tuning Guide].
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====
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+
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. Check that the wildcard DNS record resolves to the load balancer:
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+
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[source,terminal]
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----
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$ dig <wildcard_fqdn> @<dns_server>
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----
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