Installation Troubleshooting¶

This page summarizes common installation issues and troubleshooting solutions, making it easier for users to quickly resolve issues encountered during installation and operation.

UI Issues¶

Troubleshoot DCE 5.0 UI issues with diag.sh¶

Since installer v0.12.0,the diag.sh script has been added to help users quickly troubleshoot the DCE 5.0 UI issues.

Run the command:

./offline/diag.sh

Example of execution results:

FAQ1

Check if the VIP address is in the same subnet as the host. In Metallb L2 mode, it is necessary to ensure they are in the same subnet.
If a network card was added to the control node in a Global cluster causing access issues, L2Advertisement needs to be configured manually.

Refer to the Metallb documentation on this issue.

Bootstrap Node Issues¶

After shutting down and restarting the bootstrap node, the kind cluster cannot restart properly¶

After shutting down and restarting the bootstrap node, the kind cluster cannot start properly due to the lack of auto-start configuration during deployment on the openEuler 22.03 LTS SP2 operating system.

You need to run the following command to start it:

podman restart $(podman ps | grep installer-control-plane | awk '{print $1}')

Note

If this scenario occurs in other environments, you can also run this command to restart.

Missing ip6tables when deploying Ubuntu 20.04 as a bootstrap node¶

Deploying Ubuntu 20.04 as a bootstrap node may cause errors during the deployment process due to the absence of ip6tables.

Refer to the Podman known issues.

Temporary solution: Manually install iptables, refer to Install and Use iptables on Ubuntu 22.04.

After disabling IPv6 during installation, Podman on the bootstrap node cannot create containers¶

The error message is as follows:

ERROR: failed to create cluster: command "podman run --name kind-control-plane...

Solution: Re-enable IPv6 or update the bootstrap node base to Docker.

Refer to the related Podman issue: podman 4.0 hangs indefinitely if ipv6 is disabled on system

After restarting the kind container on the bootstrap node, the kubelet service cannot start¶

After the kind container restarts, the kubelet service cannot start and reports the following error:

failed to initialize top level QOS containers: root container [kubelet kubepods] doesn't exist

Solutions:

Solution 1: Restart and run the command podman restart [kind] --time 120. Do not interrupt this task with Ctrl+C during execution.

Solution 2: Run podman exec to enter the kind container and run the following command:

for i in $(systemctl list-unit-files --no-legend --no-pager -l | grep --color=never -o .*.slice | grep kubepod);
do systemctl stop $i;
done

How to uninstall data from the bootstrap node¶

After deploying the commercial version, if you want to uninstall, in addition to the cluster nodes themselves, you also need to reset the bootstrap node. The reset steps are as follows:

You need to use the sudo rm -rf command to delete these three directories:

/tmp
/var/lib/dce5/
/home/kind/etcd

Certificate Issues¶

The kubeconfig of the Global cluster needs to be updated on the bootstrap's replica¶

Prior to v0.20.0, the kubeconfig of the Global cluster stored on the bootstrap node does not automatically update. v0.20.0 supports automatic updates, run once a month.

In previous versions, you need to update the dce5-installer to v0.20.0 and then run:

dce5-installer cluster-create -c clusterconfig.yaml -m mainfest.yaml --update-global-kubeconf

Updating the certificates and kubeconfig of the kind cluster on the bootstrap node itself¶

Prior to v0.20.0, the kubeconfig of the kind cluster stored on the bootstrap node does not automatically update. v0.20.0 supports automatic updates, run once a month.

In previous versions, you need to update the dce5-installer to v0.20.0 and then run:

dce5-installer cluster-create -c clusterconfig.yaml -m mainfest.yaml --update-kind-certs

Error during installation on CentOS 7.6¶

FAQ1

Executing modprobe br_netfilter on each node where the global service cluster is installed will resolve the issue by loading br_netfilter.

CentOS Environment Preparation Issues¶

An error occurs when running yum install docker:

Failed to set locale, defaulting to C.UTF-8
CentOS Linux 8 - AppStream                                                                    93  B/s |  38  B     00:00    
Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist

You can try the following methods to resolve it:

Install glibc-langpack-en
```
sudo yum install -y glibc-langpack-en
```

If the issue persists, try:

sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
sudo yum update -y

Community Edition Issues¶

Redis hanging during DCE 5.0 reinstallation of the kind cluster¶

Issue: The Redis Pod has been stuck at 0/4 running for a long time, indicating: primary ClusterIP can not unset

Delete rfs-mcamel-common-redis in the mcamel-system namespace

kubectl delete svc rfs-mcamel-common-redis -n mcamel-system

Then re-run the installation command.

Community version fluent-bit installation failure¶

Error message:

DaemonSet is not ready: insight-system/insight-agent-fluent-bit. 0 out of 2 expected pods are ready

Check the Pod logs for the following key information:

[warn] [net] getaddrinfo(host='mcamel-common-es-cluster-masters-es-http.mcamel-system.svc.cluster.local',errt11):Could not contact DNS servers

The above issue is a bug in fluent-bit. You can refer to an issue in aws/aws-for-fluent-bit: Seeing Timeout while contacting DNS servers with latest v2.19.1