docker-moving container to another server

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I have a running container, going through edits, changes, and i need to move this to a new server.

commit

First, commit (ref)

docker commit <containerid>  myimages/lamp:v1.1

You can see the list of images that you have with “docker images.”

Save to a file(ref)

sudo docker save -o <imagefile.tar> imageid

Transfer the imagefile.tar to the new server.

Load them back (ref)

docker load -i <path to image tar file>
docker tag <Image-ID> myimages/lamp:v1.1

Run back.

Afterlogic webmail for cpanel

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Afterlogic have some interesting new look to the webmail of cpanel. Guides available at https://afterlogic.com/docs/webmail-lite/installation/install-on-cpanel

cd /root/

wget https://afterlogic.com/download/webmail-panel-installer.tar.gz

tar -xzvf ./webmail-panel-installer.tar.gz
cd ./webmail-panel-installer
chmod a+x ./installer
./installer -t lite -a install

elasticsearch reference

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Tools
– head for Chrome (ElasticSearch Head – Chrome Web Store)
– Postman (link)
– Insomenia (link)
– elasticdump – nodejs (link)

Monitoring
– ps_mem.py – monitor real memory utilization (github link)
– ps -eo size,pid,user,command --sort -size | awk '{ hr=$1/1024 ; printf("%13.2f Mb ",hr) } { for ( x=4 ; x< =NF ; x++ ) { printf("%s ",$x) } print "" }' |cut -d "" -f2 | cut -d "-" -f1 | head -n 40
from : here
- netdata, dockerable too - (link)

System tuning
sysctl -w vm.max_map_count=262144
sysctl -w vm.swappiness = 0

verify
sysctl vm.max_map_count
sysctl vm.swappiness

Reference
https://stefanprodan.com/2016/elasticsearch-cluster-with-docker/

Memory tuning
https://qbox.io/blog/memory-considerations-in-elasticsearch-deployment

GC Tuning: In Practice

Stuck shards
https://thoughts.t37.net/how-to-fix-your-elasticsearch-cluster-stuck-in-initializing-shards-mode-ce196e20ba95
https://www.datadoghq.com/blog/elasticsearch-unassigned-shards/

mysqldump script (per tables)

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#!/bin/bash

# This is PER TABLE backup. Each table will be backed up individually

## to enable passwordless mysqdump, put your password in /etc/mysql/[mysqld|percona|maria].conf.d/client.conf
# [client]
# user=""
# pass=""

THEDB="mydbname" # THE DATABASE
OUTPUT="/home/backup/mysqldump"
DATE=`date +%Y%m%d`
OPTS="--max_allowed_packet=512M "

tables=`mysql -e "use $THEDB; show tables;" | tr -d "| " | grep -v -E "^Tables_in_" `
mkdir -p $OUTPUT/$THEDB-$DATE

for table in $tables; do
STAGEDDATE=`date +%Y%m%d`
echo "Dumping table : " $table
mysqldump -a $OPTS $THEDB $table > $OUTPUT/$THEDB-$DATE/$STAGEDDATE-$table.sql
gzip $OUTPUT/$THEDB-$DATE/$STAGEDDATE-$table.sql
done

echo "Backup done at " $OUTPUT/$THEDB-$DATE

Web server tuning (apache and nginx)

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Key points

  • enable http2 & change mpm prefork to event
  • php-fpm

 

Enable http2

On apache + prefork to event – https://techwombat.com/enable-http2-apache-ubuntu-16-04/

sudo add-apt-repository ppa:ondrej/apache2
sudo apt update
sudo apt upgrade
sudo apt install php7.0-fpm 
sudo a2enmod proxy_fcgi setenvif
sudo a2enconf php7.0-fpm 
sudo a2dismod php7.0 
sudo a2dismod mpm_prefork 
sudo a2enmod mpm_event 
sudo service apache2 restart
sudo service php7.0-fpm restart

Add in <VirtualHost>… </VirtualHost> for individual site, or in apache.conf file, for global settings.

Protocols h2 h2c http/1.1

sudo a2enmod http2
sudo service apache2 restart

Nginx – Need to compile nginx with http2 module
./configure –with-compat –add-dynamic-module=../ModSecurity-nginx –with-http_ssl_module –with-stream_ssl_module –prefix=/etc/nginx –with-http_v2_module

** mod_security for nginx, follow this : https://www.nginx.com/blog/compiling-and-installing-modsecurity-for-open-source-nginx/

 

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