How to Solve Rancher Install Longhorn Error

1. Rancher Install Longhorn

When you are installing Longhorn, longhorn-driver-deployerand longhorn-managerfailing to start successfully.

Search in the app storeLonghorn

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Others keep the default, just startclick

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2. Solution

View longhorn-managerone of the Pod logs as follows:

2022/02/22 02:45:53 proto: duplicate proto type registered: VersionResponse 
time="2022-02-22T02:45:53Z" level=error msg="Failed environment check, please make sure you have iscsiadm/open-iscsi installed on the host" 
time="2022-02-22T02:45:53Z" level=fatal msg="Error starting manager: Environment check failed: Failed to execute: nsenter [--mount=/host/proc/1/ns/mnt --net=/host/proc/1/ns/net iscsiadm --version], output , stderr, nsenter: failed to execute iscsiadm: No such file or directory\n, error exit status 127" 

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The missing iscsiadmcommand is found through the log error report. You can install the command according to your system. The relevant information queried is as follows:

https://github.com/longhorn/longhorn/issues/1493

https://longhorn.io/docs/0.8.0/install/requirements/

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My system is CentOS and each node needs to install:

[root@k8s-master01 ~]# yum install iscsi-initiator-utils

After installation, select the Pod that cannot be successfully started and redeploy it.

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