K8easy: one click installation of K8S highly available cluster (Revised Version)

Keywords: Linux Kubernetes kubeadm

If the original link installation is not successful, you can refer to my version.
Kubedm binary deploys k8s cluster. The whole deployment process is relatively cumbersome, but it is helpful for entrants to preliminarily understand k8s components, networks and other information through installation, so they still need to know.

What this article recommends is a software that can quickly deploy multi node and highly available K8S cluster: k8easy, with built-in components such as Dashboard, Prometheus, Grafana, node exporter and so on.
be careful:
1. All nodes require kernel version > 4.2
2. For all new nodes, installation resources such as installer, kubernetes-server-linux-amd64.tar.gz and pack.2020.10.02.bin should also be prepared in advance.
Other advantages are as follows:

One click installation. It only takes 3 minutes to install a system. After installation, the complete monitoring is also installed and can be used directly. (supports not only single master but also 3master high availability scheme)
The new version is released, supports 1.19.x, adds nginx ingress and helm components, and supports automatic discovery.
There is no need for configuration at all. It is completed with one click, including cluster generation.
There is no need to download any images, and all required module components are ready.
All components are installed in the system service mode, which is convenient to start and stop.
Perfect support for CentOS 7.0 and Ubuntu 16.04/18.04.

Kernel upgrade (I can only upgrade to 3.1 in this method, so I use another method) for reference
1. Upgrade the kernel offline

wget https://elrepo.org/linux/kernel/el7/x86_64/RPMS/kernel-lt-5.4.107-1.el7.elrepo.x86_64.rpm
wget https://elrepo.org/linux/kernel/el7/x86_64/RPMS/kernel-lt-devel-5.4.107-1.el7.elrepo.x86_64.rpm
yum localinstall -y kernel-lt-5.4.107-1.el7.elrepo.x86_64.rpm kernel-lt-devel-5.4.107-1.el7.elrepo.x86_64.rpm

2. Set grub kernel version

# vim /etc/default/grub
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
#Changed from saved to 0
GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet"

3. Recreate the kernel configuration

grub2-mkconfig -o /boot/grub2/grub.cfg

4. Restart and view the kernel

# uname -a
Linux prod-166-203-252 5.4.107-1.el7.elrepo.x86_64 #1 SMP Sat Mar 20 09:47:18 EDT 2021 x86_64 x86_64 x86_64 GNU/Linux

The second kernel upgrade mode

1,View current kernel version
$ uname -r

$ uname -a
Linux k8s-master 3.10.0-514.el7.x86_64 #1 SMP Tue Nov 22 16:42:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

$ cat /etc/redhat-release 
CentOS Linux release 7.3.1611 (Core) 
2,Upgrade kernel
 to update yum Source warehouse
$ yum -y update
 Enable ELRepo Warehouse
ELRepo The warehouse is community-based and used at the enterprise level Linux Warehouse, providing RedHat Enterprise (RHEL) And others based on RHEL of Linux Distribution( CentOS,Scientific,Fedora Etc.).
ELRepo Focus on hardware related software packages, including file system driver, graphics card driver, network driver, sound card driver and camera driver.

#Import public key of ELRepo warehouse

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
#Install yum source for ELRepo warehouse

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
3,View available system kernel packages
 You can see 4.4 And 4.18 Two versions

yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * elrepo-kernel: mirrors.tuna.tsinghua.edu.cn
elrepo-kernel                                                                                                                                                                 | 2.9 kB  00:00:00     
elrepo-kernel/primary_db                                                                                                                                                      | 1.8 MB  00:00:03     
Available Packages
kernel-lt.x86_64                                                                                  4.4.155-1.el7.elrepo                                                                  elrepo-kernel
kernel-lt-devel.x86_64                                                                            4.4.155-1.el7.elrepo                                                                  elrepo-kernel
kernel-lt-doc.noarch                                                                              4.4.155-1.el7.elrepo                                                                  elrepo-kernel
kernel-lt-headers.x86_64                                                                          4.4.155-1.el7.elrepo                                                                  elrepo-kernel
kernel-lt-tools.x86_64                                                                            4.4.155-1.el7.elrepo                                                                  elrepo-kernel
kernel-lt-tools-libs.x86_64                                                                       4.4.155-1.el7.elrepo                                                                  elrepo-kernel
kernel-lt-tools-libs-devel.x86_64                                                                 4.4.155-1.el7.elrepo                                                                  elrepo-kernel
kernel-ml.x86_64                                                                                  4.18.7-1.el7.elrepo                                                                   elrepo-kernel
kernel-ml-devel.x86_64                                                                            4.18.7-1.el7.elrepo                                                                   elrepo-kernel
kernel-ml-doc.noarch                                                                              4.18.7-1.el7.elrepo                                                                   elrepo-kernel
kernel-ml-headers.x86_64                                                                          4.18.7-1.el7.elrepo                                                                   elrepo-kernel
kernel-ml-tools.x86_64                                                                            4.18.7-1.el7.elrepo                                                                   elrepo-kernel
kernel-ml-tools-libs.x86_64                                                                       4.18.7-1.el7.elrepo                                                                   elrepo-kernel
kernel-ml-tools-libs-devel.x86_64                                                                 4.18.7-1.el7.elrepo                                                                   elrepo-kernel
perf.x86_64                                                                                       4.18.7-1.el7.elrepo                                                                   elrepo-kernel
python-perf.x86_64                                                                                4.18.7-1.el7.elrepo                                                                   elrepo-
4,Install the latest kernel version
$ yum --enablerepo=elrepo-kernel install kernel-ml
--enablerepo Option on CentOS The specified warehouse on the system. It is enabled by default elrepo,Used here elrepo-kernel Replace.

5,set up grub2
 After the kernel is installed, it needs to be set as the default startup option and restarted before it takes effect

View all available cores on the system:
$ sudo awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
0 : CentOS Linux (4.18.7-1.el7.elrepo.x86_64) 7 (Core)
1 : CentOS Linux (3.10.0-862.11.6.el7.x86_64) 7 (Core)
2 : CentOS Linux (3.10.0-514.el7.x86_64) 7 (Core)
3 : CentOS Linux (0-rescue-063ec330caa04d4baae54c6902c62e54) 7 (Core)
Set the new kernel to grub2 Default version of
 There are four cores on the server. We want to use 4.18 This version can be grub2-set-default 0 Command or edit /etc/default/grub File to set

Method 1. Pass grub2-set-default 0 Command settings
 Where 0 is the available kernel found above

grub2-set-default 0
 Method 2. Edit /etc/default/grub file
 set up GRUB_DEFAULT=0,The kernel with number 0 displayed by the above query is used as the default kernel:

$ vim /etc/default/grub
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=cl/root rhgb quiet"
generate grub Profile and restart
$ grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.18.7-1.el7.elrepo.x86_64
Found initrd image: /boot/initramfs-4.18.7-1.el7.elrepo.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-862.11.6.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-862.11.6.el7.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-514.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-514.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-063ec330caa04d4baae54c6902c62e54
Found initrd image: /boot/initramfs-0-rescue-063ec330caa04d4baae54c6902c62e54.img

$ reboot
$ uname -r

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

Cluster deployment
1. Download k8seasy components

wget http://dl.k8seasy.com/installer 
wget http://dl.k8seasy.com/kubernetes-server-linux-amd64.tar.gz
wget http://dl.k8seasy.com/pack.2020.10.02.bin

Of which:

installer is the installation tool.
kubernetes-server-linux-amd64.tar.gz can be downloaded from the official website and must be an AMD64 platform.
pack.2020.10.02.bin is the image file.

2. Create key
If an error is reported, the file should have no permission. Add a permission to it

chmod installer 777
./installer --genkey -hostlist=

3. Create a cluster

#If there are multiple master s, you can use the following command
./installer   -kubernetestarfile kubernetes-server-linux-amd64.tar.gz -masterip,,

# Single master
./installer   -kubernetestarfile kubernetes-server-linux-amd64.tar.gz -masterip
# The following is the print information of the single master deployment process
IP:  Eth: ens192
1> Upgrade system.
2> Install etcd.
3> Install flanneld.
4> Install haproxy.
5> Update kubernets env.
6> Install K8S API Server.
7> Install K8S Controller Server.
8> Install K8S Scheduler Server.
9> Install Docker.
10> Update Kubeadm env.
11> Install kubelet.
12> Install K8S Proxy.
13> Install coredns.
14> Install monitoring & dashboard.
15> Install Helm.
16> Install nginx-ingress.
17> Install localwebproxy.

Please use your browser to access alertmanager 
Please use your browser to access grafana default user name admin default password admin
 Please use your browser to access prometheus
 Please use your browser to access node_export
 Please use your browser to access dashboard

You can find more detail about alertmanager by visiting
You can find more detail about grafana by visiting   the default user: admin   pass: admin
You can find more detail about prometheus by visiting
You can find more detail about node_export by visiting
You can find more detail about dashboard by visiting
18> Install localwebproxy.
A configuration file has been copied lens.kubeconfig In the current directory, this configuration file can be used by various management tools (such as lens) Direct use
 Please in /etc/hosts Add the following contents to the document  s7400036261.lens.k8seasy.com
 Of which For native IP, It can also be a local computer directly accessible by any management tool IP (If the machine has multiple ip You can choose any one

K8Seasy is a tools that can help you quickly deploy Kubernetes clusters to local and cloud environmental.
K8S version: 1.11.3-1.18
installer version:
Packfile version: 2020.10.02.001
Packfile: pack.2020.10.02.bin
Packfile md5sum: 06222ec7e9dfd17efe318e94540c019d
Build Time: 
Git Hash: 
Website:  http://www.k8seasy.com  https://github.com/xiaojiaqi/k8seasy_release_page
Feature Request/Bug Report Form: https://github.com/xiaojiaqi/k8seasy_release_page/issues
Email:  k8seasy@gmail.com
License: Personal non-commercial use. License cannot be used either directly or indirectly for business purposes.

From the service, you can see that dashboard, alertmanager, grafana and node exporter have been built in.

5. Add a new node

#Copy key to new node
cp ../k8skey.pem ./
#Join the machine to the cluster
./installer   -kubernetestarfile kubernetes-server-linux-amd64.tar.gz -masterip

#If there are multiple master clusters, you can use the following command to join the cluster
./installer   -kubernetestarfile kubernetes-server-linux-amd64.tar.gz -masterip,,

Note: installation resources such as installer, kubernetes-server-linux-amd64.tar.gz and pack.2020.10.02.bin should also be prepared in advance for the new node.

6. One click unloading

# ./installer -uninstall
1>  uninstall kube-apiserver
2>  uninstall kube-controller-manager
3>  uninstall kube-proxy
4>  uninstall kube-scheduler
5>  uninstall kubelet
6>  uninstall flanneld
7>  uninstall haproxy
8>  uninstall docker
9>  uninstall etcd
10>  uninstall localwebproxy
It's done.

Posted by everydayrun on Thu, 18 Nov 2021 19:08:08 -0800