为什么我不能在 microk8s 控制器中部署图表，但我可以在 LXD 中部署

问题描述

我正在学习 Juju，我觉得它很棒，但像往常一样有问题，很少有人能解释它是如何工作的。我希望你们中的任何人都可以指导我。

问题：部署图表仅适用于 LXD 控制器。在 microk8s 中不起作用。我能做什么？为什么会发生这种情况？

列出控制器，有两个。一个 microk8s（已经安装了 Ubuntu 20.04）和

LXD Hypervisor for localhost (that I dont know perfectly what it is)

Controller        Model                   User   Access     Cloud/Region         Models  Nodes    HA  Version
lxd-staging*      lxd-staging-model       admin  superuser  localhost/localhost       3      1  none  2.8.7
microk8s-staging  microk8s-staging-model  admin  superuser  microk8s/localhost        2      1     -  2.8.7

列出模型，每个控制器一个

administrator@master-ubuntu:~$ juju models -c lxd-staging
Controller: lxd-staging

Model               Cloud/Region         Type  Status     Machines  Access  Last connection
controller          localhost/localhost  lxd   available         1  admin   just now
default             localhost/localhost  lxd   available         0  admin   3 minutes ago
lxd-staging-model*  localhost/localhost  lxd   available         0  admin   31 seconds ago

administrator@master-ubuntu:~$ juju models -c microk8s-staging
Controller: microk8s-staging

Model                    Cloud/Region        Type        Status     Access  Last connection
controller               microk8s/localhost  kubernetes  available  admin   just now
microk8s-staging-model*  microk8s/localhost  kubernetes  available  admin   never connected

在 LXD 中部署，按预期工作。

administrator@master-ubuntu:~$ juju models
Controller: lxd-staging

Model               Cloud/Region         Type  Status     Machines  Access  Last connection
controller          localhost/localhost  lxd   available         1  admin   just now
default             localhost/localhost  lxd   available         0  admin   10 minutes ago
lxd-staging-model*  localhost/localhost  lxd   available         0  admin   8 minutes ago

administrator@master-ubuntu:~$ juju deploy mysql mysqldb
Located charm "cs:mysql-58".
Deploying charm "cs:mysql-58".

在 microk8s 中部署，错误。

administrator@master-ubuntu:~$ juju models
Controller: microk8s-staging

Model                    Cloud/Region        Type        Status     Access  Last connection
controller               microk8s/localhost  kubernetes  available  admin   just now
microk8s-staging-model*  microk8s/localhost  kubernetes  available  admin   never connected

administrator@master-ubuntu:~$ juju deploy mysql mysqldb
ERROR series "xenial" in a kubernetes model not valid

解决方法

发生这种情况是因为在编写 Charm 时没有考虑到 Kubernetes。在理想的世界中，这应该无关紧要，但底层子系统确实如此。正在努力纠正此问题，但现在您可以将 MariaDB 用于 Kubernetes。