[SOLVED] Using qemu agent from command line

[shantanu]

Hi,

For quite some time, I have been experimenting with using the QEMU Agent from the commandline.
I have enabled the agent from the web gui and installed the qemu-agent package in my guest.
I am getting the results but I am not able to the same in a scripted manner.

# pveversion -v
proxmox-ve: 4.4-77 (running kernel: 4.4.35-1-pve)
pve-manager: 4.4-5 (running version: 4.4-5/c43015a5)
pve-kernel-4.4.35-1-pve: 4.4.35-77
pve-kernel-4.2.6-1-pve: 4.2.6-36
lvm2: 2.02.116-pve3
corosync-pve: 2.4.0-1
libqb0: 1.0-1
pve-cluster: 4.0-48
qemu-server: 4.0-102
pve-firmware: 1.1-10
libpve-common-perl: 4.0-85
libpve-access-control: 4.0-19
libpve-storage-perl: 4.0-71
pve-libspice-server1: 0.12.8-1
vncterm: 1.2-1
pve-docs: 4.4-1
pve-qemu-kvm: 2.7.0-10
pve-container: 1.0-90
pve-firewall: 2.0-33
pve-ha-manager: 1.0-38
ksm-control-daemon: 1.2-1
glusterfs-client: 3.5.2-2+deb8u2
lxc-pve: 2.0.6-5
lxcfs: 2.0.5-pve2
criu: 1.6.0-1
novnc-pve: 0.5-8
smartmontools: 6.5+svn4324-1~pve80
zfsutils: 0.6.5.8-pve13~bpo80

Here is what I am doing and hope to produce output:

# echo '{"execute":"guest-network-get-interfaces"}' | socat /var/run/qemu-server/100.qga -

Unfortunately, this outputs nothing!!!

But now, if I just type:

# socat /var/run/qemu-server/100.qga -

I suddenly get the output on screen: (trimmed)

{"return": [{"name": "lo", "ip-addresses": [{"ip-address-type": "ipv4", "ip-address": "127.0.0.1", "prefix": 8}, {"ip-address-type": "ipv6", "ip-address": "::1", <...trimmed...>

The complete output is correct and I ran it through "jq" as well.

My question is how to to get the output correctly in a scripted manner?

Thanks and Regards,
Shantanu

 

[shantanu]

<bump>

Any "socat" experts in the house?

Regards,
Shantanu

 

[dietmar]

First, you can use the new 'agent' command with 'qm':

# qm agent 100 network-get-interfaces

The output is JSON. Any reasonable scripting language can read that (beside unix shell).

 

[shantanu]

First, you can use the new 'agent' command with 'qm':

# qm agent 100 network-get-interfaces

The output is JSON. Any reasonable scripting language can read that (beside unix shell).

Thank you!!!! This is indeed good news!

 

[fabian]

First, you can use the new 'agent' command with 'qm':

# qm agent 100 network-get-interfaces

The output is JSON. Any reasonable scripting language can read that (beside unix shell).

"jq" is a nice CLI json parser that allows parsing / filtering / .. json in bash (or other sh) scripts