26 янв2023

Hard soft links disk

Written by Super User. Posted in Articles Unix

https://habr.com/ru/company/srg/blog/462967/   

-----df -ih

 

Use below command to find out how many file descriptors are currently being utilized:

[root@ansible ~]# more /proc/sys/fs/file-nr
1216    0       100000

vi /etc/sysctl.conf    >> fs.file-max = 262144

ulimit -a 

soft nofile 65536

hard nofile 65536

 sysctl -w fs.file-max=262144

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19 янв2023

Docker swarm

Written by Super User. Posted in Articles Unix

sudo apt-get remove docker docker-engine docker.io containerd runc

sudo apt-get update
sudo apt-get install \
    ca-certificates \
    curl \
    gnupg \
    lsb-release
sudo mkdir -p /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-compose-plugin

docker run -d -p 3000:80 nginx

 

  docker swarm init --advertise-addr {outside ip}
  docker info
  docker node ls

docker network create -d overlay crm_network

 

docker service create --replicas 6 --name apa-sim -p 30000:80 cohenaj194/apache-simple

 

apt instapp jq
docker container inspect --format '{{json .NetworkSettings.Networks}}' $(docker container ls -lq) | jq '.'

https://garutilorenzo.github.io/nginx-ingress-controller/

cat en2_dev_php_my_admin.yml cat en1_dev_php_my_admin.yml

version: '3.7'
services:

  php_my_admin:
    image: 2204198622/php_my_admin:1.3.18
    environment:
      - PMA_ARBITRARY=0
      - PMA_HOSTS=env2_db2_mysql,env2_db1_mysql
      - PMA_PORT=3306
        #    ports:
        #- 30000:80


    networks:
      - ingress
    deploy:
      replicas: 1
      restart_policy:
        condition: any
      update_config:
        parallelism: 1
        delay: 10s
        order: start-first
      resources:
        limits:
          memory: 4096M
          cpus: "2"
      labels:
        ingress.host: kodak2.ksi.kiev.ua
networks:
  ingress:
    external: true
    name: ingress-routing

version: '3.7'
services:

  php_my_admin:
    image: 2204198622/php_my_admin:1.3.18
    environment:
      - PMA_ARBITRARY=0
      - PMA_HOSTS=env1_db2_mysql,env1_db1_mysql
      - PMA_PORT=3306
        #    ports:
        #      - 30000:80
    networks:
      - crm_network
    deploy:
      replicas: 1
      restart_policy:
        condition: any
      update_config:
        parallelism: 1
        delay: 10s
        order: start-first
      labels:
        ingress.host: kodak1.ksi.kiev.ua
      resources:
        limits:
          memory: 4096M
          cpus: "2"
networks:
  crm_network:
    external: true
    name: ingress-routing
# docker stack deploy -c en2_dev_php_my_admin.yml en2_ # docker stack deploy -c en1_dev_php_my_admin.yml en1_

 

 

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18 янв2023

L2TP on Linux

Written by Super User. Posted in Articles Unix

Very good arcticle http://www.crosspeer.com/tutorial_Linux_L2TP_VPN_Client.html

Step 0: Util Install

apt-get update
apt-get install openswan xl2tpd

Step 1: Configure IpSec

vi /etc/ipsec.conf

config setup
conn %default
    ikelifetime=60m
    keylife=20m
    rekeymargin=3m
    keyingtries=1
    keyexchange=ikev1
    authby=secret
    ike=aes128-sha1-modp1024,3des-sha1-modp1024!
    esp=aes128-sha1-modp1024,3des-sha1-modp1024!
conn L2TP-PSK
    keyexchange=ikev1
    left=%defaultroute
    auto=add
    authby=secret
    type=transport
    leftprotoport=17/1701
    rightprotoport=17/1701
    right=xxx.xxx.xxx.xxx

vi /etc/ipsec.secrets

0.0.0.0: xxx.xxx.xxx.xxx   PSK "XXXXXXXX"

/etc/init.d/ipsec start
ipsec up L2TP-PSK

Step 2: Configure L2TP

vi /etc/xl2tpd/xl2tpd.conf

[lac L2TP-PSK]
lns = xxx.xxx.xxx.xxx 
ppp debug = yes
pppoptfile = /etc/ppp/options.l2tpd.client
name = L2TP-PSK
length bit = yes
redial = yes ; Перподключаться при потере соединения
redial timeout = 5 ; Сколько ждать между попытками соединиться
autodial = yes ; Автоматически устанавливать связь при старте сервиса

vi /etc/ppp/options.l2tpd.client

ipcp-accept-local
ipcp-accept-remote
refuse-eap
refuse-chap
refuse-pap
require-mschap-v2
noccp
noauth
logfile /var/log/xl2tpd.log
idle 1800
mtu 1410
mru 1410
defaultroute
usepeerdns
debug
connect-delay 5000
name ksi-VPN
password xxxxxxxxxxxxxxxxxxxxxxxx
 

 

Step 3: RUN L2TP

/etc/init.d/ipsec start
/etc/init.d/xl2tpd start
ipsec auto --up L2TP-PSK
echo "c vpn-connection" > /var/run/xl2tpd/l2tp-control

Step 4: ADD ROUTE

ip route add 192.168.88.250 via $(ip address show dev ppp0 | grep -Po '(?<=peer )(\b([0-9]{1,3}\.){3}[0-9]{1,3}\b)') dev ppp0

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17 янв2023

Docker Counter replicas in docker conteiners

Written by Super User. Posted in Articles Unix

version: '3.7'
services:
  dev_mysql:
    image: mysql:8.0.16
    command: --default-authentication-plugin=mysql_native_password 
    environment:
      - MYSQL_DATABASE='dev_mysql'
      - MYSQL_USER='user'
      - MYSQL_PASSWORD='password'
      - MYSQL_ROOT_PASSWORD='xxxxxxxxxxxxxxx'
      - REPLICA={{.Task.Slot}}
    ports:
      - 3355:3306
    networks:
      - crm_network
    deploy:
      replicas: 6
      restart_policy:
        condition: any
      update_config:
        parallelism: 1
        delay: 10s
        order: start-first
      resources:
        limits:
          memory: 2048M
          cpus: "2"
networks:
  crm_network:
    external: true
 

#LISTID=$(docker ps -q) && for i in $LISTID; do (docker exec -it $i "env" | grep REPLICA); done

REPLICA=5
REPLICA=2
REPLICA=4
REPLICA=6
REPLICA=3
REPLICA=1
 

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17 окт2022

mail client on Linux CLI

Written by Super User. Posted in Articles Unix

Installing mailx

yum -y update
yum install -y mailx

We can now start sending e-mails using

create a symbolic link

ln -s /bin/mailx /bin/email

###Set an External SMTP Server to Relay E-Mails

vi /etc/mail.rc

edit

set smtp=smtps://smtp.gmail.com:465
set smtp-auth=login
set smtp-auth-user=Адрес электронной почты защищен от спам-ботов. Для просмотра адреса в вашем браузере должен быть включен Javascript.
set smtp-auth-password=YOURPASSWORD
set ssl-verify=ignore
set nss-config-dir=/etc/pki/nssdb/

example usage :

echo "Your message" | mail -v -s "Message Subject" email@address
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