Linux, FreeBSD, Juniper, Cisco / Network security articles and troubleshooting guides

**Posted:** Tue Jan 16, 2018 6:23 am

Code:

vmkfstools -c 400G -d zeroedthick -a lsilogic disk-name-400G.vmdk
Create: 100% done.

Checkout below vmware link for more options, or use vmkfstools -H
https://pubs.vmware.com/workstation-9/index.jsp?topic=%2Fcom.vmware.ws.using.doc%2FGUID-8D4D25C1-A14F-4133-B13A-7F7D4C3A59E3.html

**Posted:** Tue Jan 16, 2018 6:11 am

Code:

# vmkfstools -c 5G –diskformat thin testdisk2.vmdk
Extra arguments at the end of the command line.

OPTIONS FOR FILE SYSTEMS:

Above command would contain hidden characters as shown below:

$ echo -n 'vmkfstools -c 5G –diskformat thin testdisk2.vmdk' | wc -c
50
$ echo -n 'vmkfstools -c 5G –diskformat thin testdisk2.vmdk' | xxd
00000000: 766d 6b66 7374 6f6f 6c73 202d 6320 3547 vmkfstools -c 5G
00000010: 20e2 8093 6469 736b 666f 726d 6174 ...

**Posted:** Wed May 24, 2017 7:28 am

To login with ssh private key in Vmware ESXi, store the public key in the following file: /etc/ssh/keys-root/authorized_keys

Code:

# cat mykey.pub >> /etc/ssh/keys-root/authorized_keys

Make sure to use double angle brackets to avoid losing the contents of /etc/ssh/keys-root/authorized_keys.

**Posted:** Wed May 03, 2017 8:51 am

Code:

~ # vim-cmd vimsvc/license --show
[200] Sending request for installed licenses...[200] Complete, result is:
...

**Posted:** Sat Feb 21, 2015 8:21 pm

Both Vmware ESXi and the open source alternative KVM (Kernel Virtualization Module) that turns a Linux server into a native hypervisor can run as nested hypervisors, meaning they are not installed on the bare metal machine, but they are themselves virtual machines under the other.

KVM nested in ESXi 5.5 - Requirements

In order for KVM module to load (or the packages to even install), the CPU has to have the Intel/AMD virtualization technology flags ...

**Posted:** Mon Jan 26, 2015 7:07 am

We are all familiar with Vmware ESXii vSwitches and how vSwitch ports are assigned to each machine individually. The vsphere client is a powerful tool for configuring vswitches, ports and VMs, but I prefer the black background and white font any day.

First step is to get the ID of the network port for the specific VM with esxtop command.

Identify vSwitch port ID using esxtop:

Run the "esxtop" command and press "n" key to ...

**Posted:** Mon Jan 26, 2015 6:53 am

"esxtop" command is similar to Linux "top" command and it shows system (cpu/network) utilization statistics.

Some vmware esxi deployments will show very strange output in "esxtop" command:e(PCPU 4)\%P-State P10","\\apophis\PCPU Power State(PCPU 4)\%P-State P11","\\apophis\PCPU Power State(PCPU 4)\%P-State P12","\\apophis\PCPU Power State(PCPU 4)\%P-State P13","\\apophis\PCPU Power State(PCPU 4)\%P-State P14","\\apophis\PCPU Power State(PCPU 4)\%P-State P15","\\apophis\PCPU Power State(PCPU 5)\%C-State C0","\\apophis\PCPU Power State(PCPU 5)\%C-State C1","\\apophis\PCPU Power State(PCPU 5)\%C-State C2","\\apophis\PCPU Power State(PCPU 5)\%C-State C3","\\apophis\PCPU Power State(PCPU 5)\%P-State P0","\\apophis\PCPU Power State(PCPU 5)\%P-State P1","\\apophis\PCPU Power State(PCPU ...

**Posted:** Wed Feb 19, 2014 4:05 pm

Find the VMX file of the virtual machine and add the following line WHILE THE MACHINE IS TURNED OFF:

Code:

bios.bootdelay = 5000

The above line will add a 5seconds delay leaving enough time for bios related operations.

**Posted:** Tue Feb 04, 2014 9:05 am

After a complete installation of the KVM hypervisor, libvirt and the rest of utilities, VNC server can be used to remotely access the graphical console (aka Video output) of the VMs via the Virtual Machine Manager.

But by default VNC will not run:
# chkconfig --list | grep vnc
vncserver 0:off 1:off 2:off 3:off 4:off 5:off 6:off
# chkconfig --levels 5 vncserver on
# chkconfig --list | grep vnc
vncserver 0:off 1:off 2:off 3:off 4:off ...

**Posted:** Fri Jan 31, 2014 5:35 am

Installing FreeBSD under KVM requires a little tick to access the serial console (text) from KVM virsh because FreeBSD redirects output to video if using graphic installation (vidconsole).

Code:

# virsh console VM2
Connected to domain VM2
Escape character is ^]

After the box is installed and running configure the "comconsole" under /boot/loader.conf and configure the serial con

Code:

# cat /boot/loader.conf 
console="comconsole"
# grep ttyu0 /etc/ttys 
ttyu0   "/usr/libexec/getty std.9600"   vt100   on  secure

Now reboot the ...

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