RED HAT LINUX6 REVIEW
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To all of supporters and thank u for all of your support and today i am sharing the review of red hat and how to use and its command also.
To all of supporters and thank u for all of your support and today i am sharing the review of red hat and how to use and its command also.
Major new versions of Red Hat Enterprise Linux (RHEL) don't come along that often — which is the way the platform's corporate buyers generally like it. Still, the relentless march of technology means that new versions are needed from time to time, and with RHEL 6 Red Hat is both playing catch-up on advances since the last big overhaul and looking to future-proof its platform.
To be fair, there have been interim updates since RHEL 5 was introduced back in 2007 — the most recent, RHEL 5.5, was just under a year ago. However, that did little to address the underlying scalability of the Red Hat Linux distro — a charge that can't be levelled at its successor, which is designed to take full advantage of the latest developments in multi-core and other hardware technologies, and then some.
Estimates as to exactly how scalable RHEL 6 really is vary considerably. Ask the marketing people and they'll quote huge numbers: some claim 64,000 or more, making the Red Hat OS one of the most scalable production platforms around. However, the hardware needed to substantiate such claims simply hasn't been made yet, and the actual numbers tested and supported are a lot lower. According to the datasheet, RHEL 6 can handle up to 4,096 cores/threads per system image: that's up from 64 in RHEL 5, with an associated increase in addressable memory — from 1TB to 64TB.
However, these are still theoretical limits and the currently supported figures for x64 systems are much more modest at 128 cores/threads and 2TB of RAM, with even lower ceilings for IBM POWER and System z platforms. That said, when new hardware comes along the numbers will rise without the need for any extra updates. RHEL 6 also comes ready-equipped to add processors and RAM on the fly, on hardware that supports such options.
COMANDS
System basics
| Task | RHEL6 | ||
|---|---|---|---|
| View subscription information | /etc/sysconfig/rhn/systemid subscription-manager identity | ||
| Configure subscription | rhn_register rhnreg_ks subscription-manager | ||
| View RHEL version information | |||
| View system profile | sosreport dmidecode lstopo lscpu | ||
Basic configuration
| Graphical configuration tools | system-config-* | ||
| Text-based configuration tools | system-config-*-tui | ||
| Configure printer | system-config-printer | ||
| Configure network | system-config-network | ||
| Configure system language | system-config-language | ||
| Configure time and date | system-config-date date | ||
| Synchronize time and date | ntpdate /etc/ntp.con | ||
| Configure keyboard | system-config-keyboard | ||
| Configure SSH | /etc/ssh/ssh_config /etc/ssh/sshd_config ~/.ssh/config ssh-keygen | ||
Jobs and services
| Task | |||
|---|---|---|---|
| List all services | chkconfig --list ls /etc/init.d/ | ||
| List running services | service --status-all | ||
| Start/stop service | service name start service name stop | ||
| Enable/disable service | chkconfig name on chkconfig name off | ||
| View service status | service name status | ||
| Check if service is enabled | chkconfig name --list | ||
| Create new service file or modify configuration | chkconfig --add | ||
| View run level/target | runlevel who -r | ||
| Change run level/target | /etc/inittab init run_level | ||
| Configure logging | /etc/rsyslog.conf | ||
| View logs | /var/log | ||
| Configure system audit | add audit=1 to kernel cmdline auditctl /etc/audit/auditd.conf /etc/audit/audit.rules authconfig /etc/pam.d/system-auth pam_tty_audit kernel module | ||
| View audit output | aureport /var/log/faillog | ||
| Schedule/batch tasks | cron at batch | ||
| Find file by name | locate | ||
| Find file by characteristic | find | ||
| Create archive | tar cpio zip | ||
Software management
| Task | |||
|---|---|---|---|
| Install software | yum install yum groupinstall | ||
| View software info | yum info yum groupinfo | ||
| Update software | yum update | ||
| Upgrade software | yum upgrade | ||
| Configure software repository | subscription-manager repos /etc/yum.repos.d/*.repo | ||
| Find package owning file | rpm -qf filename yum provides filename-glob | ||
| View software version | rpm -q packagename | ||
| View installed software | rpm -qa yum list installed | ||
Networking
| Task | |||
|---|---|---|---|
| Configure name resolution | /etc/hosts /etc/resolv.conf | ||
| Configure hostname | /etc/sysconfig/network | ||
| View network interface info | ip addr | ||
| Configure network interface | /etc/sysconfig/network-scripts/ifcfg-* | ||
| View routes | ip route | ||
| Configure routes | ip route add system-config-network /etc/sysconfig/route-iface | ||
| Configure firewall | iptables and ip6tables /etc/sysconfig/ip*tables | iptables and ip6tables /etc/sysconfig/ip*tables system-config-firewall | |
| View ports/sockets | ss lsof netstat | ||
Security and identity
| Task | |||
|---|---|---|---|
| Configure system security | /etc/selinux/config chcon restorecon semanage setsebool system-config-selinux | ||
| Report on system security | sealert | ||
| LDAP, SSSD, Kerberos | authconfig authconfig-tui authconfig-gtk | ||
| Network users | getent | ||
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