apt-key warning when sudo apt update run

Issue: apt-key warning when sudo apt update run

Update below file:
cat /etc/apt/sources.list.d/download_docker_com_linux_ubuntu.list

sudo apt-key list
apt-key export 0EBFCD88 | sudo gpg --dearmour -o /usr/share/keyrings/docker.gpg
#edit file
sudo vim /etc/apt/sources.list.d/download_docker_com_linux_ubuntu.list

#from
deb https://download.docker.com/linux/ubuntu focal stable

#to
deb [arch=amd64 signed-by=/usr/share/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu focal stable

This should resolve issue.

Elasticsearch Index Red / Yellow

Issue: Elasticsearch Index Red / Yellow

Connect to Stack management in kibana:
Kibana -> DevTools

# Get cluster health
GET _cluster/health

# Get Index helath - Look for the red/yellow index
GET /_cat/indices

# Update number_of_replicas to 0.
PUT /.ds-logs-apm.error-default-2023.10.06-000002/_settings
{
  "number_of_replicas": 0
}

#This will change for all index with this patent
PUT /.ds-traces-apm-default-2023*/_settings
{
  "number_of_replicas": 0
}

This should resolve issue.

logrotate is not rotating logs

Issue: logrotate is not rotating logs files

logrotate update below file, let's start with this file:
cat /var/lib/logrotate/status

logrotate state -- version 2
"/var/log/ufw.log" 2022-3-20-6:25:1
"/var/log/nginx/web_xxx.access.log" 2022-3-23-6:25:1
"/var/log/nginx/access.log" 2018-8-2-21:0:0
"/var/log/apt/history.log" 2021-11-8-6:25:1
"/var/log/user.log" 2022-3-23-6:0:0

We can see some of the logs are rotating but not all so let's run logrotate in debug mode and look for the error if any
sudo /usr/sbin/logrotate -d /etc/logrotate.conf

compressing log with: /bin/gzip
renaming /home/deployer/apps/api_abc_co/shared/log/sidekiq.log.2.gz to /home/deployer/apps/api_abc_co/shared/log/sidekiq.log.3.gz (rotatecount 2, logstart 1, i 2),
renaming /home/deployer/apps/api_abc_co/shared/log/sidekiq.log.1.gz to /home/deployer/apps/api_abc_co/shared/log/sidekiq.log.2.gz (rotatecount 2, logstart 1, i 1),
renaming /home/deployer/apps/api_abc_co/shared/log/sidekiq.log.0.gz to /home/deployer/apps/api_abc_co/shared/log/sidekiq.log.1.gz (rotatecount 2, logstart 1, i 0),
copying /home/deployer/apps/api_abc_co/shared/log/sidekiq.log to /home/deployer/apps/api_abc_co/shared/log/sidekiq.log.1
truncating /home/deployer/apps/api_abc_co/shared/log/sidekiq.log
removing old log /home/deployer/apps/api_abc_co/shared/log/sidekiq.log.3.gz
error: error opening /home/deployer/apps/api_abc_co/shared/log/sidekiq.log.3.gz: No such file or directory

it's failing as it's unable to create a file. it's a bug. manually create a file and re-run logrotate in debug mode and fix all the errors.


This should resolve issue.

iterm2 configuration which make work nicer

 

Setup Laptop for developers - Ubuntu

The system setup is an integral part of the day-to-day life of any developer. After all, we spend more than half of our wake-up time in front of the system. 

So it is necessary to make sure that we have set up the system to be as productive and functional as possible. 

Steps:

• Install Ubuntu operating system
• Install Git

// To install git
sudo apt install git// To check the git version
git --version//To setup the username and email to communitcate with any repo
git config --global user.name "Your Name"
git config --global user.email "youremal@email.com"

• Install ZSH follow this blog 

Linux server expand disk size

Oracle Cloud - Linux server expand disk size

Extend your disk from the storage server 1st. in this case we are using Oracle Cloud so we have extended in OCI console
fdisk -l

[root@ebs121db1-mylocal-com ~]# fdisk -l
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.

Disk /dev/sda: 50.0 GB, 50010783744 bytes, 97677312 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 1048576 bytes
Disk label type: gpt
Disk identifier: A21E6499-33C5-401E-9330-8331C0E94D2C


#         Start          End    Size  Type            Name
 1         2048       411647    200M  EFI System      EFI System Partition
 2       411648     17188863      8G  Linux swap
 3     17188864     97675263   38.4G  Microsoft basic

Disk /dev/sdb: 536.9 GB, 536870912000 bytes, 1048576000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 1048576 bytes

You can see that disk is resized and it's visible in operating system level. next is we need to extend it.
resize2fs /dev/sdb

[root@ebs121db1-mylocal-com ~]# resize2fs /dev/sdb
resize2fs 1.45.4 (23-Sep-2019)
Filesystem at /dev/sdb is mounted on /u01; on-line resizing required
old_desc_blocks = 19, new_desc_blocks = 32
The filesystem on /dev/sdb is now 131072000 (4k) blocks long.

[root@ebs121db1-mylocal-com ~]# df -h /u01
Filesystem      Size  Used Avail Use% Mounted on
/dev/sdb        492G  260G  209G  56% /u01
[root@ebs121db1-mylocal-com ~]#

/u01 mount point size is changed.

Install htop in Oracle Linux 7

Install htop in Oracle Linux 7

htop is not default install and it's not part of default repo so when we try to install htop it throw this message
yum install htop

[root@ebs121db1 yum.repos.d]# yum install htop
Loaded plugins: langpacks, ulninfo
No package htop available.
Error: Nothing to do

Solution: we need to enable this repo to make htop avaibale and then install it.
yum-config-manager --enable ol7_developer_EPEL
yum-config-manager --disable ol7_developer_EPEL
Install htop command yum install -y htop

[root@ebs121db1 yum.repos.d]# yum install -y htop
Loaded plugins: langpacks, ulninfo
Resolving Dependencies
--> Running transaction check
---> Package htop.x86_64 0:2.2.0-3.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

==============================================================================================================================================================================================================================================
 Package                                             Arch                                                  Version                                                    Repository                                                         Size
==============================================================================================================================================================================================================================================
Installing:
 htop                                                x86_64                                                2.2.0-3.el7                                                ol7_developer_EPEL                                                103 k

Transaction Summary
==============================================================================================================================================================================================================================================
Install  1 Package

Total download size: 103 k
Installed size: 218 k
Downloading packages:
htop-2.2.0-3.el7.x86_64.rpm                                                                                                                                                                                            | 103 kB  00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : htop-2.2.0-3.el7.x86_64                                                                                                                                                                                                    1/1
  Verifying  : htop-2.2.0-3.el7.x86_64                                                                                                                                                                                                    1/1

Installed:
  htop.x86_64 0:2.2.0-3.el7

Complete!
[root@ebs121db1 yum.repos.d]#