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This article focuses on "Kubernetes etcd data viewing and migration methods", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "Kubernetes's etcd data viewing and migration method".

1. View etcd data kubeadm default installation

The methods are as follows:

ETCDCTL_API=3 etcdctl-endpoints= https://[127.0.0.1]:2379\-cacert=/etc/kubernetes/pki/etcd/ca.crt\-cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt\-key=/etc/kubernetes/pki/etcd/healthcheck-client.key\ get / registry/deployments/default-prefix-keys-only

Because the etcd instance in Kubernetes uses https, you need to specify information such as certificate, that is, the cacert/cert/key parameter.

The above parameters are that when using the default installation of kubeadm, the certificate is located in the / etc/kubernetes/pki directory of the host, and you can use the above command to access it after installing etcdctl-client.

Cfssl certificate installation

Using the etcd cluster installed with cfssl certificates, the directory of certificates can be customized and the certificate format is * .pem. The methods are as follows:

ETCDCTL_API=3 etcdctl-endpoints= https://[10.1.1.202]:2379\-cacert=/etc/kubernetes/pki/etcd-certs/ca.pem\-cert=/etc/kubernetes/pki/etcd-certs/client.pem\-key=/etc/kubernetes/pki/etcd-certs/client-key.pem\ get / registry/deployments/default-prefix-keys-only

I put the certificate here in the / etc/kubernetes/pki/etcd-certs directory.

2. Migrate etcd data

Use the etcd make-mirror command to do this.

The following command transfers the etcd instance data installed using kubeadm to the etcd cluster installed using cfssl.

ETCDCTL_API=3 etcdctl make-mirror\-endpoints= https://[127.0.0.1]:2379\-cacert=/etc/kubernetes/pki/etcd/ca.crt\-cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt\-key=/etc/kubernetes/pki/etcd/healthcheck-client.key\-dest-cacert=/etc/kubernetes/pki/etcd-certs/ca.pem\-dest-cert=/etc/kubernetes/pki/etcd-certs/client.pem\- Dest-key=/etc/kubernetes/pki/etcd-certs/client-key.pem\ https://[10.1.1.202]:2379

You can then use the method of 1 above to view the data.

At this point, I believe you have a deeper understanding of "Kubernetes's etcd data viewing and migration methods". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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