Run one or multiple commands on a remote server
ssh root@host <<'ENDSSH' #commands to run on remote host ENDSSH
Run a local script on a remote server. (none interactive, cant open nano). the script does not need to start with #/!bin/bash
ssh root@host < dalesjo-install-postfix.sh
Run a command interactive, ex start nano on remote server.
ssh -t root@cdn2.dalesjo.com 'nano /etc/postfix/main.cf'
When uninstalling software you compiled yourself you can run make -n install to see what the make install command did. For Nginx you only had to remove /sbin/nginx before installning NginX from YUM.
# make -n install make -f objs/Makefile install make[1]: Entering directory `/root/install/cache/nginx-1.9.9' test -d '/' || mkdir -p '/' test -d '/' || mkdir -p '/' test ! -f '/sbin' || mv '/sbin' '/sbin.old' cp objs/nginx '/sbin' test -d '/etc/nginx' || mkdir -p '/etc/nginx' cp conf/koi-win '/etc/nginx' cp conf/koi-utf '/etc/nginx' cp conf/win-utf '/etc/nginx' test -f '/etc/nginx/mime.types' || cp conf/mime.types '/etc/nginx' cp conf/mime.types '/etc/nginx/mime.types.default' test -f '/etc/nginx/fastcgi_params' || cp conf/fastcgi_params '/etc/nginx' cp conf/fastcgi_params '/etc/nginx/fastcgi_params.default' test -f '/etc/nginx/fastcgi.conf' || cp conf/fastcgi.conf '/etc/nginx' cp conf/fastcgi.conf '/etc/nginx/fastcgi.conf.default' test -f '/etc/nginx/uwsgi_params' || cp conf/uwsgi_params '/etc/nginx' cp conf/uwsgi_params '/etc/nginx/uwsgi_params.default' test -f '/etc/nginx/scgi_params' || cp conf/scgi_params '/etc/nginx' cp conf/scgi_params '/etc/nginx/scgi_params.default' test -f '/etc/nginx/nginx.conf' || cp conf/nginx.conf '/etc/nginx/nginx.conf' cp conf/nginx.conf '/etc/nginx/nginx.conf.default' test -d '/var/run/nginx' || mkdir -p '/var/run/nginx' test -d '/var/log/nginx/access' || mkdir -p '/var/log/nginx/access' test -d '//html' || cp -R html '/' test -d '/var/log/nginx/errors' || mkdir -p '/var/log/nginx/errors' make[1]: Leaving directory `/root/install/cache/nginx-1.9.9'
Source
To add a second ip-number to an network interface create a new ifcfg file ex /etc/sysconfig/network-scripts/ifcfg-enp1s0f0:0
TYPE="Ethernet" BOOTPROTO="static" DEVICE="enp1s0f0:1" ONBOOT="no" ZONE=public IPADDR=80.67.x.x PREFIX=31 GATEWAY=80.67.x.x
The default configuration for that interface might have parameters such as UUID, NAME those are not needed. change ONBOOT to yes after testing the configuration. To test run.
systemctl restart network.service
The goal is to allow root to login with username/password from local IP-addresses. But only allow root to login with public key authentication from internet.
First change the following settings in /etc/ssh/sshd_config. this will allow normal users to login with username/password but root users must use public key authentication.
PasswordAuthentication yes PermitRootLogin without-password
Second, add the following to the end of /etc/ssh/sshd_config. Its important that you are in the end of the file because how sshd_config is read by the daemon.
Match address 192.168.0.0/16 PermitRootLogin yes
Heres some tips and trix for setting up an named server on CentOS 7.
I Recently updated my OP5 machine later after an reboot got the error message. Important to know is that i run my VM (Virtual Machine) on a headless server so i have no more tools then to VNC to a VM and therefore its hard to get into grub at boot as the timeout was set to 5 seconds.
Kernel panic - not syncing: VFS: Unable to mount root fs on unit block(0,0)
howto renew your DHCP lease without restarting your network interface. First release your current lease and then request a new for interface eth0.
[code language=”bash”]
dhclient -r eth0
dhclient eth0
[/code]
[code language=”bash”]
virt-install \
–name=Windows10-VM1 \
–ram=4096 \
–cpu=host \
–vcpus=2 \
–os-type=windows \
–os-variant=win7 \
–disk /srv/dev-disk-by-label-SSD/kvm/Windows10-VM1,size=200,sparse=true,bus=virtio \
–disk /zfs-pool-1/kvm/iso/Windows10.iso,device=cdrom,bus=ide \
–disk /zfs-pool-1/kvm/iso/virtio-win.iso,device=cdrom,bus=ide \
–network bridge=br0 \
–graphics vnc,listen=0.0.0.0
[/code]