CRON & SENDMAIL TROUBLESHOOTING STEPS Check cron status root@ee7467603704:/pynetauto# crontab -l #to list current cron job * * * * * echo “Hello world” >> /var/log/cron.log 2>&1 * * * * * /usr/bin/python3 /home/gday.py >> /var/log/cron.log 2>&1 52 1 * * * /usr/bin/python3 /var/log/time.py >> /var/log/cron.log 2>&153 1 * * * echo “Hello vPAN_updater10” >>… Read More Python script Cron scheduler – Troubleshooting sendmail example
This is part of LinkedIn training from Anthony Sequeira’s “Learning Ansible” training videos. Added the adding loopbacks as he has not mentioned about it. Step 1: Create YAML file root@u20s0:~/an# nano orchestrate.yml name: “Orchestration example”hosts: logicservers #Server groupserial: 1 #sequential tasks: name: “Shutdown Server” #Task namedebug:msg: “Shutdown {{ inventory_hostname }}” #print message embedded with inventory_hostname… Read More Ansible – Running ansible-playbook against local loopback for testing
Step 1: Check .sshroot@u20s0 ls -l ~/.ssh/id_*.pub Step 2: Create assh keyssh-keygen -t rsa -b 1024 -C bchoi Generating public/private rsa key pair.Enter file in which to save the key (/root/.ssh/id_rsa): /home/bchoi/.ssh/id_rsa/home/bchoi/.ssh/id_rsa already exists.Overwrite (y/n)? yEnter passphrase (empty for no passphrase):Enter same passphrase again:Your identification has been saved in /home/bchoi/.ssh/id_rsaYour public key has been saved… Read More Ansible – Generate ssh key and add to controlled nodes
To make a dictionary of the same values with unique keys. for x in range(1, 5):… d[“device{0}”.format(x)] = “router”…d{‘device1’: ‘router’, ‘device2’: ‘router’, ‘device3’: ‘router’, ‘device4’: ‘router’} =================================================== Use exec commmand and f string formatting (for Python 3.6+) for x in range(5):… exec(f’device{x} = “switch”‘)…print(device0)switchprint(device1)switchprint(device2)switchprint(device3)switchprint(device4)switch for x in range(5):… exec(“device” + str(x) + ” = ‘switch’”)…print(device0)switchprint(device1)switchprint(device2)switchprint(device3)switchprint(device4)… Read More Python – assign multiple variables to items in a list or a range
To get the Default Gateway IP address of Linux Using netstat method [bchoi@ubuntu20s1 ~]$ netstat -rnKernel IP routing tableDestination Gateway Genmask Flags MSS Window irtt Iface0.0.0.0 10.11.12.1 0.0.0.0 UG 0 0 0 ens19210.11.12.0 0.0.0.0 255.255.255.192 U 0 0 0 ens192172.172.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0172.182.0.0 172.192.71.1 255.255.0.0 UG 0 0 0 ens224172.192.71.0 0.0.0.0… Read More Linux – Get Default GW and DNS information
REST API Test
Create inventory file Inventory file: root@u20s0:~/ansible# cat inventory[all]u20s1 ansible_ssh_host=192.168.30.191u20s2 ansible_ssh_host=192.168.30.192u20db1 ansible_ssh_host=192.168.30.193u20db2 ansible_ssh_host=192.168.30.194[web]u20s1u20s2[db]u20db1u20db2[backup]u20db2 2. To create files on servers, run the ansible-playbook root@u20s0:~/ansible# ansible-playbook -i /root/ansible/inventory 2-1-tasks.yml -e file_state=touch -i option = tells the ansible where the inventory file reside, otherwise it will default (use) to “/etc/ansible/hosts” -e option = environmental variable, in this case sets… Read More Ansible test drive – Create and delete files on multiple servers [Day 2]
I did not want to learn Ansible as it felt like I was swimming with my clothes and shoes on. Although, I already know the outcome of this but I am going to give one more try. This is the day 1 of Ansible. 5 Servers set up, generate ssh key and run the basic… Read More Ansible test drive – Set-up and verification [Day 1]
http://searchunifiedcommunications.techtarget.com/tip/DiffServ-QoS-model-works-wonders-for-VoIP-networks QoS Models – Voice load and voice application data (traffic) tolerate minimal variation in delay, packet loass or jitter. The voice quality degradation is immediately felt by the users. QoS is a tool which can be impletmented to effectively transport voice traffice over IP, which gives voice traffic priority over other traffic. 1.… Read More QoS note
Linux has a great free video conversion tool which runs on the CLI. Install ffmpeg using ‘sudo apt install ffmpeg’ run the following command,
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