CentOS

thanks trevor for clarifications. i have not configured any rules from iptables, nor have i configured any other firewall rules for firewalld except opened one port. basically i installed centos 8 and started playing security first (trying to secure the server first). so i have no clues where those ...

hello guys: my understanding is that firewalld on centos and iptables are actually the same. where does this default rule sets come from? how could i change this almost "accept all" behavior? i checked /etc/sysconfig and the default file iptables-config is more like sample config. [user@localhost ~]...

btw, i am learning and trying different tricks

thanks for help. yeah i fixed it with selinux command "semanage".

hello guys: i am newbie to centos linux 8. i have a few questions regarding to change sshd port 22 to other numbers and firewalld. 1) by default the firewalld is running: [user@localhost ~]$ sudo firewall-cmd --state [sudo] password for user: running 2) the default port 22 (default) worked fine. use...

Check your logs to see why it stopped. thanks. i fixed it. i changed ssh port number (/etc/ssh/sshd_config) and it didn't work, so i changed back , for some reasons it killed the service. in the end, i used "semanage" per follow link: http://sharadchhetri.com/2014/10/15/centos-7-rhel-7-change-opens...

hello all: i am trying to login my centos 7 remotely via ssh but the attempts were rejected: user@lab:~:$ ssh mlu@192.168.1.10 ssh: connect to host 192.168.1.10 port 22: Connection refused user@lab:~:$ ssh mlu@192.168.1.10 ssh: connect to host 192.168.1.10 port 22: Connection refused i used nmap and...

TrevorH wrote:Perhaps all those packages are already installed. Check if you have libvirt, qemu-kvm, qemu-kvm-tools and libguestfs already installed.

thanks. just used "yum info | grep whatever" and they are all there. thanks!

hi all: i did update for my new centOS 7 (1511). after it booted back, now it has three options instead of two options when it was first time installed: CentOS Linux (3.10.0-327.3.1.e17.x86_64) 7 (Core) <<< this one seems to be newly added after updates CentOS Linux (3.10.0-327.e17.x86_64) 7 (Core) ...

Hmm. They rewrote the yum groups stuff for CentOS 7 nad it appears to me to be mostly broken :-( A bit more investigation seems to show that although Virtualisation exists as a group, it is empty. It seems the correct group is called "Virtualization Host" and needs to be installed using quotes arou...