Category: লিনাক্স এবং উনিক্স । Linux and Unix

AutoFS and Mounting in Linux/Redhat/CentOS

AutoFS and Mounting in Linux/Redhat/CentOS echo “AutoFS – Automatic FS system Mounting – Dec 26th, 2017 by Sayed” check if Autofs installed or not yum list installed | grep autofs I just installed; hence it is there you can install with yum -y install autofs 944 yum -y install autofs then you can enable autofs …

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On File Systems and Linux Commands (Redhat/CentOs/Fedora)

On File Systems and Linux Commands (Redhat/CentOs/Fedora) echo “Dec 26th, 2017, Sayed Ahmed, Justetc Technologies” On file Systems – Target Audience: Technical People. Software Developers and System/Network Administrators or DevOps  (or wanna be) / and /boot are the default Linux file systems you can also configure /home, /opt, /var, /tmp, /usr as separate file systems …

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Users and Groups management in Linux (Redhat/CentOS/Fedora)

Users and Groups management in Linux (Redhat/CentOS/Fedora) Target Audience: Technical people who knew or already know (to some extent) – just wanna review Yes, from my history 622 echo “dec 25th, 2017 – sayed”   User and password related files 623 cat /etc/passwd 624 cat /etc/shadow 625 cat /etc/group 626 cat /etc/gshadow There are some …

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NTP related commands/Linux

598 echo “dec 24th, 2017” 599 echo “NTP Client” 600 yum list ntp 601 yum list installed |grep ntp 602 To activate ntp 603 yum -y install ntp system-config-date 604 cat /etc/ntp.conf 605 grep ^server /etc/ntp.conf 606 systemctl restart ntpd 607 systemctl enable ntpd 608 systemctl start ntpd 609 ntpq -p 612 nmtui 613 ip …

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Network Interface, Network Clients related Linux/Redhat/CentOS commands

echo “Dec 24th, 2017” 532 echo “Basic Networking in Linux” 533 hostname 534 uname -a 535 uname -n 536 cat /etc/hostname 537 nmcli general hostname 538 changing hostname temporarily 539 hostname server10.example.com 540 for permanent change 541 hostnamectl set-hostname server100.example.com 542 or change /etc/hostname file 543 vim /etc/hostname 544 restart systemctl 545 systemctl restart systemd-hostnamed …

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TCP Wrappers in Linux/CentOS/Redhat/Fedora

TCP Wrappers in Linux/CentOS/Redhat/Fedora yum info tcp_wrappers yum install tcp_wrappers-devel.x86_64 506 reboot 507 ifdown ens33 508 ifup ens33 509 yum install tcp_wrappers-devel.x86_64 510 yum -y install tcp_wrappers-devel.x86_64 511 ls /var/ftp/pub/Packages/ 512 ls /etc/yum.repos.d/local.repo 513 vim /etc/yum.repos.d/local.repo 514 systemctl status vsftpd 515 systemctl start vsftpd 516 systemctl enable vsftpd 517 yum -y install tcp_wrappers-devel.x86_64 518 cat …

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SSH/SSHD/OpenSSH in CentOS/Redhat Linux

Experiment with SSH/SSHD/OpenSSH in CentOS/Redhat Linux Yes, from  my history (Probably a review for the technical people, who already knew these sometimes in the past) 461 echo “dec 24th, 2017” 462 vim /etc/ssh/sshd_config 463 echo “SSH Related Commands” 464 scp -> secure copy 465 tscp -> secure copy for windows 466 sftp -> secure ftp …

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Linux: LVM : Logical Volume Manager : Multiple Hard Disk and Partition and Volume Management

On RedHat/Centos Linux – LVM experiments Concepts to understand: Physical Volume: Physical Hard Drive or  Partitions in Physical Hard Drive Physical Extent:  One unit of space usually 4 MB. Volume Group: One or multiple Physical Volumes can be assigned to a Volume Group Logical Volume: Logical volumes are created from the volume groups. This is …

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Centos/Redhat লিনাক্স এ yum ইন্সটলার সার্ভার কিভাবে কনফিগার করবেন

Centos/Redhat লিনাক্স এ yum ইন্সটলার সার্ভার কিভাবে কনফিগার করবেন Mount Installer ISO mkdir /mnt/dvd1 mount /dev/sr0 /mnt/dvd1 Check if FTP server is installed systemctl status vsftpd systemctl start vsftpd Install ftp Server. Using rpm as yum is not available yet [default yum needs the internet, kindof] cd /mnt/dvd1/Packages/ rpm -ivh vsftpd-3.0.2-22.el7.x86_64.rpm systemctl start vsftpd systemctl …

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ইউজার ডায়াগ্রাম প্রটোকল

রিদওয়ান বিন শামীম   টিসিপি/আইপি প্রটোকল স্যুইটের সরলতম ট্রান্সপোর্ট লেয়ার কমিউনিকেশন প্রটোকল হল ইউজার ডায়াগ্রাম প্রটোকল । এটিতে কম সংখ্যক যোগাযোগ কৌশল প্রয়োগ করা হয়। ইউজার ডায়াগ্রাম প্রটোকলকে অনির্ভরযোগ্য যোগাযোগ প্রটোকল বলা হলেও এটি আইপি সার্ভিস ব্যবহার করে যেটিতে সেরা সরবরাহ কৌশল ব্যবহৃত হয়। ইউজার ডায়াগ্রাম প্রটোকলে ডাটা প্যাকেট গ্রহণকারী কোনোরূপ প্রাপ্তি সংবাদ পাঠায় না …

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