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Post  Post subject: Juniper vSRX (Virtual SRX) under KVM on Centos 6.5  |  Posted: Wed Jan 29, 2014 8:09 am

Joined: Tue Aug 04, 2009 9:16 am
Posts: 250


Juniper vSRX (Virtual SRX) under KVM on Centos 6.5

This is a post on how to set up Juniper's virtual SRX on KVM hypervisor (QEMU hardware virtualization manager).
IIRC, KVM is part of the CentOS/Red Hat Enterprise Linux distributions since version 6, replacing XEN.

1. I'll begin this guide with first step: Downloading CentOS and vSRX images
CentOS LiveCD location:
vSRX location: See

2. Burn and boot the CentOS and on the "Automatic Boot in 8 seconds" press down and select "Install"

3. Set Hostname, TimeZone, root password.

4. Storage custom layout for me:
Centos drive layout in my case is:
1. sda 200MB /boot ext3 - format.
1. sdb 20G rootVG for the hypervisor - 20G - rootVG (19G rootLV for the root file system and 1G for swap). Choose to format the / mountpoint (rootLV).
2. sdc VolumeGroup for VMs - 128G - vmVG with a simple logical volume "vmLV" to hold VM images.
Few comments here: the /boot filesystem needs to be "ext3" filesystem for some older systems otherwise there will be a mount error. Check for more info.

the / and /boot mountpoints need to be formated so check the option for this.

5. Create a remote management user. "admin" in my case. I'm using a generic user as this system is not Internet facing and it does not present a high security risk. Use of well known usernames (dictionary usernames) like "admin" for public servers should be avoided as these are highly exploited by crackers.

6.Enable SSH access and (for testing purposes) root login:
   # who -r
      run-level 5
#chkconfig --list | grep ssh
   sshd    5:off
#chkconfig sshd --levels 5 on
#chkconfig --list | grep ssh
   sshd    5:on
# vim /etc/ssh/sshd_config
   PermitRootLogin yes
# /etc/init.d/sshd start

Again: This system is in an isolated environment. Do not enable root login via ssh, do not allow ssh connections from Internet.

7. Once CentOS has been installed and running, install KVM, libvirt, qemu and other packages required to setup
# yum install kvm qemu-kvm python-virtinst libvirt libvirt-python virt-manager libguestfs-tools tunctl -y

8. Prepare networking part.
It would seem that Centos 6.5 NetworkManager service does not yet support bridging so it is necessary to use the classic network init scripts for the bridge.
Disable NetworkManager and enable the "network" service:
# chkconfig NetworkManager off
# chkconfig network on
# service NetworkManager stop
# service network start

# cd /etc/sysconfig/network-scripts/
# cat ifcfg-eth0

# cat ifcfg-br0

# cat ifcfg-eth1

# cat ifcfg-br1

Few notes here: Keep the "NM_CONTROLLED=no" for eth0/eth1/br0/br1 interfaces.

Restart and check network service:
# service network restart
# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.0017f20b2b6c       no              eth0
br1             8000.0017f20b2b6d       no              eth1

So far so good. eth0 and eth1 are assigned to their respective bridges.

9. Preparing storage pools for the virtual machines.
To recap, my storage layout consists of the root Volume Group for the hypervisor and the a "vmVG" to host virtual machine storage.
# vgs
  VG     #PV #LV #SN Attr   VSize   VFree
  rootVG   1   2   0 wz--n-  20.00g    0
  vmVG     1   1   0 wz--n- 128.81g    0
# lvs
  LV     VG     Attr       LSize   Pool Origin Data%  Move Log Cpy%Sync Convert
  rootLV rootVG -wi-ao----  18.55g                                             
  swapLV rootVG -wi-ao----   1.44g                                             
  vmLV   vmVG   -wi-a----- 128.81g   
# pvs
  PV         VG     Fmt  Attr PSize   PFree
  /dev/sda2  rootVG lvm2 a--   20.00g    0
  /dev/sda3  vmVG   lvm2 a--  128.81g    0

I will be using the "vmLV" logical volume as an ext4 filesystem that will host virtual machine img disks.
# mkfs.ext4 /dev/vmVG/vmLV                   
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
8445952 inodes, 33767424 blocks
1688371 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
1031 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872

Writing inode tables: done                           
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 34 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

# e2label /dev/vmVG/vmLV vmLV     
# mount LABEL=vmLV /var/lib/libvirt/pools/pool1       
# grep vmLV /etc/fstab
LABEL=vmLV              /var/lib/libvirt/pools/pool1 ext4 defaults 1 3

So the filesystem is ready. It's time to create a qemu storage pool using "dir" type:
# vim /etc/libvirt/qemu/pool/pool1.xml             

<pool type="dir">

# vim /etc/libvirt/qemu/pool/pool1.xml             

<pool type="dir">

10. Creating the virtual machine using the vSRX jva file:
Copy the JVA virtual SRX file onto the host in any directory you may choose and install the VM:
# bash junos-vsrx-12.1X46-D10.2-domestic.jva VM1 -s pool1 -i 2:virtio:br0,br1
Extracting ...
Checking existence of VM VM1 ...
HOST = , storage = pool1, vm_name = VM1, img = junos-vsrx-12.1X46-D10.2-domestic-1387348130/junos-vsrx-12.1X46-D10.2-domestic.img
Checking existence of storage pool pool1 ...
pool1                active     no       
Getting storage path ...
Storage path: /var/lib/libvirt/pools/pool1
SHA1(junos-vsrx-12.1X46-D10.2-domestic.img)= 9dd2390cc79b554360ec7c12e7ca63e9b781e783
-rw-r--r--. 1 17105 950 260M Dec 18 07:29 junos-vsrx-12.1X46-D10.2-domestic-1387348130/junos-vsrx-12.1X46-D10.2-domestic.img
cp junos-vsrx-12.1X46-D10.2-domestic-1387348130/junos-vsrx-12.1X46-D10.2-domestic.img /var/lib/libvirt/pools/pool1/VM1.img
Checking host CPU features ...
Creating VM on the host ...
Domain VM1 defined from VM1.xml

Checking the VM ...
-     VM1                            shut off

One problem here: The jva file deploys the networks as "network" type instead of "bridge". For this, the xml file needs to be fixed and reused to define the virtual machine.
Modify and backup the VM1.xml file as below:
<     <interface type='network'>
>     <interface type='bridge'>
<       <source network='br0'/>
>       <source bridge='br0'/>
>        <target dev='vnet0'/>
<     <interface type='network'>
>     <interface type='bridge'>
<       <source network='br1'/>
>       <source bridge='br1'/>
>        <target dev='vnet1'/>

Change the source type to "bridge" and add the targets "vnet0" and "vnet1". Save the /etc/libvirt/qemu/VM1.xml file to /etc/libvirt/qemu/VM1.xml.bkp
Delete the machine and recreate it using the above xml (renamed after the VM was undefined):
# virsh create /etc/libvirt/qemu/VM1.xml         
Domain VM1 created from /etc/libvirt/qemu/VM1.xml

The VM started automaticaly:
# virsh list --all           
Id    Name                           State
24    VM1                            running

Now the bridge configuration displays the br0 and br1 bridges containing eth0/vnet0 and eth1/vnet1 interfaces. The ethX interfaces are physical devices whereas the vnet0/1 are the interfaces assigned to the virtual machines for direct access to the bridge.

11. Open your VM's console and configure the virtual SRX:
# virsh console VM1
Connected to domain VM1
Escape character is ^]

XXXhostnameXXX (ttyd0)

login: root

--- JUNOS 12.1X46-D10.2 built 2013-12-18 02:43:42 UTC


root@XXXhostnameXXX> show interfaces terse | match ge-
ge-0/0/0                up    up 
ge-0/0/0.0              up    up   inet   
ge-0/0/1                up    up 
ge-0/0/1.0              up    up   inet   

root@XXXhostnameXXX> configure
Entering configuration mode
The configuration has been changed but not committed

root@XXXhostnameXXX# set system host-name VM1-vSRX

root@XXXhostnameXXX# set system root-authentication plain-text-password
New password:
Retype new password:

root@XXXhostnameXXX# set interfaces ge-0/0/0.0 family inet address
root@XXXhostnameXXX# set routing-options static route 0/0 next-hop
root@XXXhostnameXXX# set security zones security-zone trust interfaces ge-0/0/0.0 host-inbound-traffic system-services ping
root@XXXhostnameXXX# commit
root@VM1-vSRX# run ping
PING ( 56 data bytes
64 bytes from icmp_seq=0 ttl=64 time=7.438 ms
--- ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max/stddev = 7.438/7.438/7.438/0.000 ms

And the VM is accessible now.
This tutorial is not bulletproof. Debate remains on wheter "e1000" or "virtio" drivers should be used.

Post  Post subject: Re: Juniper vSRX (Virtual SRX) under KVM on Centos 6.5  |  Posted: Wed Jan 29, 2014 8:12 am

Joined: Tue Aug 04, 2009 9:16 am
Posts: 250

If SELinux is disabled, following error will appear:
# virsh start VM1
error: Failed to start domain VM1
error: unsupported configuration: Unable to find security driver for label selinux

This is due to SELinux being disabled. Either enable SELinux or remove the SELinux label from VM config file by editing the machine:
# virsh edit VM1
  <seclabel type='dynamic' model='selinux' relabel='yes'>

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