With SysV init, by default, getty processes are started on the first six virtual consoles. They can be accessed with the Ctrl+Alt+F1 to Ctrl+Alt+F6 key combination. systemd starts the getty processes only when needed. That means, only after you change to, for instance, the second virtual terminal by pressing Ctrl+Alt+F2 is the getty process started […]
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Systemd has replaced sysVinit as the default service manager in RHEL 7. Some of the sysVinit commands have been symlinked to their RHEL 7 counterparts, however this will eventually be deprecated in favor of the standard systemd commands in the future. SysVinit V/s systemd runlevels Here is a comparison between SysVinit runlevels V/s systemd targets. […] Question : My system is taking a lot of time to boot. How can I find out which services are taking long time to start? Answer : systemd-analyze command can be utilized to find out information about how much each service took to start. systemd-analyze time can provide overall information about how long it took […] Question : I cannot reach my Samba server after starting the service. How do I open the port to be able to connect to my Samba server? Solution : If running FirewallD, it is mandatory to open the ports used by the Samba server in order for it to properly accept clients. To begin with […] When trying to start/enable the iptables daemon you receive the errors: # systemctl enable iptables Failed to issue method call: Access denied # systemctl start iptables Failed to start iptables.service: Unit iptables.service failed to load: No such file or directory. Solution: Starting with RHEL 7, firewalld is introduced and by default the iptables package is […] By default, RHEL 7 uses the FirewallD service to provide network security. FirewallD must be stopped and disabled when using the iptables service: # systemctl stop firewalld.service # systemctl disable firewalld.service # systemctl enable iptables.service # systemctl start iptables.service The iptables service is now provided by a separate package called iptables-services: # yum info iptables-services […] Question: How to open a port in RHEL 7 using the firewall-cmd command? Solution: To begin with check the firewalld status using the systemctl command : # systemctl status firewalld ? firewalld.service – firewalld – dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled) Active: active (running) since Sat 2016-10-29 21:47:04 IST; 1 weeks […] yum-cron is an optional package starting from Red Hat Enterprise Linux 6, this is a plugin for yum. From man page of yum-cron : yum-cron is a simple way to call yum commands from cron. It provides configuration to keep repository metadata up to date, and to check for, download, and apply updates. The yum-cron […] Question: How to install Apache and configure Apache httpd to run as a service? Answer: Installing the Apache package If you have the apache package downloaded, you can install it using rpm command as root user. # rpm -ivh httpd If you have yum repository configured, use the recommended way of installing Apache httpd, i.e. […] Question: Why CentOS 7 / RHEL 7 have many tmpfs (6 tmpfs filesystem), are these tmpfs mandatory for OS? What are the mount /run/user/1000, /run/user/0, /run/user/45, /sys/fs/cgroup for? Answer: If you run df -hP in RHEL 7 system you would find many tmpfs file systems mounted. # df -hP Filesystem Size Used Avail Use% Mounted […] |
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