a. Network Down
1. Find the network interface device name for the ip address to be blocked via:
ifconfig
For example:
eth0 Link encap:Ethernet HWaddr 02:42:ac:11:00:02
inet addr:172.17.0.2 Bcast:172.17.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:9 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:737 (737.0 B) TX bytes:0 (0.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:547263 errors:0 dropped:0 overruns:0 frame:0
TX packets:547263 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:62402205 (62.4 MB) TX bytes:62402205 (62.4 MB)
2. Run the following command to shutdown the nic (eth0 here)and bring it up after some time
sudo ifconfig eth0 down && sleep 180 && sudo ifconfig eth0 up
3. Run the HA testing script
b. Disk Down
1. Find the mount point of the disk to shut down via:
df -h
For example:
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 50G 12G 39G 23% /
devtmpfs 252G 0 252G 0% /dev
tmpfs 252G 21M 252G 1% /dev/shm
tmpfs 252G 2.3G 250G 1% /run
tmpfs 252G 0 252G 0% /sys/fs/cgroup
/dev/sda2 1014M 308M 707M 31% /boot
/dev/sda1 200M 12M 189M 6% /boot/efi
/dev/mapper/centos-home 3.7T 2.1T 1.6T 56% /home
192.168.11.9:/volume5/datapool 21T 8.4T 13T 40% /mnt/nfs_datapool
tmpfs 51G 0 51G 0% /run/user/1001
2. Unmount the device from the mount point, e.g., /dev/sda1
sudo umount /boot/efi
3. Mount back the device via one of the following commands:
sudo mount /boot/efi
sudo mount /dev/sda1
sudo mount /dev/sda1 /boot/efi
c. System Down
Use one of the Linux system commands:
sudo halt
sudo reboot
sudo poweroff
or
sudo shutdown -H now
sudo shutdown -r now
sudo shutdown -h now
Make sure you have access to the machine after shut it down. Otherwise, always use reboot