Author: ServerOk – ServerOK

Restart Apache if failed

Posted on April 17, 2021 by ServerOk

This bash script check web site every 5 minutes, restart the web server if web site is not responding. Create a file

mkdir /usr/serverok
vi /usr/serverok/check_httpd.sh

1 2	mkdir /usr/serverok vi /usr/serverok/check_httpd.sh

Add

#!/bin/bash
# Author: Yujin Boby
# Web: https://serverok.in
# Email: admin@serverok.in

/usr/bin/wget --tries=1 --timeout=30 -O /dev/null https://YOUR_DOMAIN.EXTN/

if [ $? -ne 0 ]; then
    systemctl restart httpd
    datetime=`date "+%Y%m%d %H:%M:%S"`
    echo $datetime "failure">>/var/log/sok-web.log
fi

#!/bin/bash

# Author: Yujin Boby

# Web: https://serverok.in

# Email: [email protected]

/usr/bin/wget --tries=1 --timeout=30 -O /dev/null https://YOUR_DOMAIN.EXTN/

if [ $? -ne 0 ]; then

systemctl restart httpd

datetime=`date "+%Y%m%d %H:%M:%S"`

echo $datetime "failure">>/var/log/sok-web.log

In above code, replace https://YOUR_DOMAIN.EXTN/ with your sites actual url. Make it executable

chmod 755 /usr/serverok/check_httpd.sh

1	chmod 755 /usr/serverok/check_httpd.sh

Create a cronjob

crontab -e

1	crontab -e

Add

*/5 * * * *  /usr/serverok/check_httpd.sh > /dev/null 2>&1

1	/5 * * * /usr/serverok/check_httpd.sh > /dev/null 2>&1

See Server Monitoring […]

CloudPanel – Free Hosting Control Panel Debian 10/Nginx

Posted on April 16, 2021 (April 16, 2021) by ServerOk

CloudPanel is a free hosting control panel, that make deploying web application on cloud easier. It use Nginx web server, support multile PHP versions, comes with nginx configuration for various popular CMS and web applications. https://www.cloudpanel.io/ Install CloudPanel CloudPanel need a server with Debian 10. To install CloudPanel, run

apt update && apt -y upgrade && apt -y install curl wget sudo
curl -sSL https://installer.cloudpanel.io/ce/v1/install.sh | sudo bash

1 2	apt update && apt -y upgrade && apt -y install curl wget sudo curl -sSL https://installer.cloudpanel.io/ce/v1/install.sh \| sudo bash

After install you can access […]

Redirect a site to www using PHP

Posted on April 14, 2021 (April 14, 2021) by ServerOk

To redirect a site to url with www using PHP, you can use following PHP code

<?php

$domainName = $_SERVER['HTTP_HOST'];

if (strpos($domainName, 'www') === false) {
    header("HTTP/1.1 301 Moved Permanently");
    $urlNew = 'https://www.' . $domainName .  $_SERVER['REQUEST_URI'];
    Header("Location: $newUrl");
    exit;
}

<?php

$domainName = $_SERVER['HTTP_HOST'];

if (strpos($domainName, 'www') === false) {

header("HTTP/1.1 301 Moved Permanently");

$urlNew = 'https://www.' . $domainName . $_SERVER['REQUEST_URI'];

Header("Location: $newUrl");

exit;

}

Add this code in your index.php file or another file included by index.php See Redirect […]

Repair MySQL database with mysqlcheck

Posted on April 10, 2021 (April 10, 2021) by ServerOk

To check and repair all databases in a database run

mysqlcheck -A --auto-repair -u root -p

1	mysqlcheck -A --auto-repair -u root -p

Forcefully optimize all tables, automatically fixing table errors that may come up.

mysqlcheck -A --auto-repair -f -o -u root -p

1	mysqlcheck -A --auto-repair -f -o -u root -p

To check all databases

mysqlcheck --all-databases -u root -p -c

1	mysqlcheck --all-databases -u root -p -c

To analyze all tables in all databases:

mysqlcheck --all-databases -u root -p -a

1	mysqlcheck --all-databases -u root -p -a

To repair all tables in all databases:

mysqlcheck --all-databases -u root -p -r

1	mysqlcheck --all-databases -u root -p -r

To optimize all tables in all databases:

mysqlcheck --all-databases -u root -p -o

1	mysqlcheck --all-databases -u root -p -o

See MySQL […]

Easy Kubernetes setup on Ubuntu with microk8s

Posted on April 8, 2021 (April 8, 2021) by ServerOk

To install microk8s, run

sudo snap install microk8s --classic

1	sudo snap install microk8s --classic

Enable rules in firewall

sudo ufw allow in on cni0
sudo ufw allow out on cni0
sudo ufw default allow routed

sudo ufw allow in on cni0

sudo ufw allow out on cni0

sudo ufw default allow routed

Enable addons

microk8s enable dns dashboard storage

1	microk8s enable dns dashboard storage

To see status of current addons, run

microk8s status

1	microk8s status

Here is status for a defaul install

root@ip-172-26-0-217:~# microk8s status
microk8s is running
high-availability: no
  datastore master nodes: 127.0.0.1:19001
  datastore standby nodes: none
addons:
  enabled:
    ha-cluster           # Configure high availability on the current node
  disabled:
    ambassador           # Ambassador API Gateway and Ingress
    cilium               # SDN, fast with full network policy
    dashboard            # The Kubernetes dashboard
    dns                  # CoreDNS
    fluentd              # Elasticsearch-Fluentd-Kibana logging and monitoring
    gpu                  # Automatic enablement of Nvidia CUDA
    helm                 # Helm 2 - the package manager for Kubernetes
    helm3                # Helm 3 - Kubernetes package manager
    host-access          # Allow Pods connecting to Host services smoothly
    ingress              # Ingress controller for external access
    istio                # Core Istio service mesh services
    jaeger               # Kubernetes Jaeger operator with its simple config
    keda                 # Kubernetes-based Event Driven Autoscaling
    knative              # The Knative framework on Kubernetes.
    kubeflow             # Kubeflow for easy ML deployments
    linkerd              # Linkerd is a service mesh for Kubernetes and other frameworks
    metallb              # Loadbalancer for your Kubernetes cluster
    metrics-server       # K8s Metrics Server for API access to service metrics
    multus               # Multus CNI enables attaching multiple network interfaces to pods
    portainer            # Portainer UI for your Kubernetes cluster
    prometheus           # Prometheus operator for monitoring and logging
    rbac                 # Role-Based Access Control for authorisation
    registry             # Private image registry exposed on localhost:32000
    storage              # Storage class; allocates storage from host directory
    traefik              # traefik Ingress controller for external access
root@ip-172-26-0-217:~#

root@ip-172-26-0-217:~# microk8s status

microk8s is running

high-availability: no

datastore master nodes: 127.0.0.1:19001

datastore standby nodes: none

addons:

enabled:

ha-cluster # Configure high availability on the current node

disabled:

ambassador # Ambassador API Gateway and Ingress

cilium # SDN, fast with full network policy

dashboard # The Kubernetes dashboard

dns # CoreDNS

fluentd # Elasticsearch-Fluentd-Kibana logging and monitoring

gpu # Automatic enablement of Nvidia CUDA

helm # Helm 2 - the package manager for Kubernetes

helm3 # Helm 3 - Kubernetes package manager

host-access # Allow Pods connecting to Host services smoothly

ingress # Ingress controller for external access

istio # Core Istio service mesh services

jaeger # Kubernetes Jaeger operator with its simple config

keda # Kubernetes-based Event Driven Autoscaling

knative # The Knative framework on Kubernetes.

kubeflow # Kubeflow for easy ML deployments

linkerd # Linkerd is a service mesh for Kubernetes and other frameworks

metallb # Loadbalancer for your Kubernetes cluster

metrics-server # K8s Metrics Server for API access to service metrics

multus # Multus CNI enables attaching multiple network interfaces to pods

portainer # Portainer UI for your Kubernetes cluster

prometheus # Prometheus operator for monitoring and logging

rbac # Role-Based Access Control for authorisation

registry # Private image registry exposed on localhost:32000

storage # Storage class; allocates storage from host directory

traefik # traefik Ingress controller for external access

root@ip-172-26-0-217:~#

To see all pods/services/deploymens, run

microk8s kubectl get all --all-namespaces

1	microk8s kubectl get all --all-namespaces

To avoid typing microk8s before kubectl, run

alias kubectl="microk8s kubectl"

1	alias kubectl="microk8s kubectl"

You can add this to .bashrc to make it permanent. To run […]

Install Elasticsearch 7 on Ubuntu for Magento 2.3

Posted on March 31, 2021 by ServerOk

To install Elasticsearch, add the key

wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -

1	wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch \| sudo apt-key add -

add apt repository

sudo apt-get install apt-transport-https
echo "deb https://artifacts.elastic.co/packages/7.x/apt stable main" | sudo tee /etc/apt/sources.list.d/elastic-7.x.list

1 2	sudo apt-get install apt-transport-https echo "deb https://artifacts.elastic.co/packages/7.x/apt stable main" \| sudo tee /etc/apt/sources.list.d/elastic-7.x.list

install elasticsearch with apt

apt-get update
apt-get install elasticsearch

1 2	apt-get update apt-get install elasticsearch

Set elasticsearch to start on boot

systemctl daemon-reload
systemctl enable elasticsearch

1 2	systemctl daemon-reload systemctl enable elasticsearch

Elasticsearch can be started and stopped as follows:

systemctl start elasticsearch
systemctl stop elasticsearch

1 2	systemctl start elasticsearch systemctl stop elasticsearch

verify elasticsearch is running with

systemctl status elasticsearch

1	systemctl status elasticsearch

or with

curl localhost:9200

1	curl localhost:9200

if it fail to start, you can debug with

journalctl --unit elasticsearch

1	journalctl --unit elasticsearch

See elasticsearch […]

Restart IIS from command line

Posted on March 30, 2021 (March 30, 2021) by ServerOk

To restart IIS from command line, click on start, search for “cmd”, right click on “Command Prompt” select run as Administrator. On the command prompt, run

iisreset

iisreset

Start IIS To start IIS from command line, run

iisreset /start

1	iisreset /start

Stop IIS

iisreset /stop

1	iisreset /stop

See IIS […]

Vue.js

Posted on March 29, 2021 by ServerOk

Vue.js is a popular javascript framework. To install Vue, you need Node.js installed.

sudo su
curl -sL https://deb.nodesource.com/setup_15.x | bash -
apt-get install -y nodejs
apt-get install gcc g++ make

sudo su

curl -sL https://deb.nodesource.com/setup_15.x | bash -

apt-get install -y nodejs

apt-get install gcc g++ make

Install Vue.js with

sudo npm install -g @vue/cli

1	sudo npm install -g @vue/cli

Verify Vue.js working with

vue --version

1	vue --version

To create a project, run

vue create app1
cd app1
npm run serve

vue create app1

cd app1

npm run serve

[…]

How to Enable WordPress Toolkit in Cpanel/WHM

Posted on March 29, 2021 (March 29, 2021) by ServerOk

To install WordPress Toolkit in Cpanel/WHM, first install it with command

curl https://wp-toolkit.plesk.com/cPanel/installer.sh | sh

1	curl https://wp-toolkit.plesk.com/cPanel/installer.sh \| sh

After installation, you will be able to see WordPress Toolkit in CPanel. You can enable/disable WordPress toolkit under Feature Manager in WHM.

WHM > Packages > Feature Manager

1	WHM > Packages > Feature Manager

How to install WordPress using WordPress Toolkit This video will show how to install WordPress using WordPress Toolkit in Cpanel […]

How to remove the Google Chrome Reading List

Posted on March 28, 2021 (March 28, 2021) by ServerOk

Reading List is a new experimental feature added to google chrome browser version 89. It allows you to quickly save web pages into a list for reading later. Many of us keep too many browser tabs open because we need to read them and don’t have time to read it now, in such cases, it […]