GNS3 Server doesn't verify $PATH env variable.

[vint66]

I'm trying to have several QEMU versions but $PATH variable doesn't work. Same issue https://github.com/GNS3/gns3-gui/issues/2720

GNS3 v2.2.0rc4, running on remote Ubuntu 18.04 server

[grossmj]

@vint66 what are the path of your Qemu binaries?

[vint66]

It is /opt/qemu/qemu-4.1/bin/

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/opt/qemu/qemu-4.1/bin:/snap/bin

[grossmj]

I have copied qemu into /tmp and started the gns3server with PATH=$PATH:/tmp python3 -m gns3server --local

Then I made request to list all Qemu binaries with curl -X GET "http://127.0.0.1:3080/v2/compute/qemu/binaries"

And I could see the new path. So not sure what is going on here

The binaries must start with "qemu-system" or "qemu-kvm" or just be named "qemu" in order to be listed.

[vint66]

Hi Jeremy,

I'll try to test on fresh install and let you know.

Basically for now I my observations are:

• if I call os.environ["PATH"] I see right PATHs
• API call to GNS3 server down't show the same
• It is remote server on Ubuntu 18.04
• One more same issue https://gns3.com/qa/using-newer-version-of-qemu-bina

[vint66]

Same issue on fresh install. GNS3 is running as root (in case you will be concerned about permissions).

gns3@gns3:~$ env | grep -i path PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/opt/qemu/qemu-4.1/bin:/snap/bin

gns3@gns3:~$ curl -X GET "http://127.0.0.1:3080/v2/compute/qemu/binaries" [ { "path": "/usr/bin/qemu-system-x86_64", "version": "2.11.1" }, { "path": "/usr/bin/qemu-system-i386", "version": "2.11.1" }

import shutil shutil.which("qemu-system-x86_64") '/usr/bin/qemu-system-x86_64' import os os.environ["PATH"] '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/opt/qemu/qemu-4.1/bin:/snap/bin'

gns3@gns3:~$ ll /opt/qemu/qemu-4.1/bin/ drwxr-xr-x 2 root root 4096 Sep 27 16:13 ./ drwxr-xr-x 6 root root 4096 Sep 27 16:13 ../ -rwxr-xr-x 1 root root 22512 Sep 27 16:13 elf2dmp -rwxr-xr-x 1 root root 18416 Sep 27 16:13 ivshmem-client -rwxr-xr-x 1 root root 226416 Sep 27 16:13 ivshmem-server -rwxr-xr-x 1 root root 30856 Sep 27 16:13 qemu-edid -rwxr-xr-x 1 root root 370192 Sep 27 16:13 qemu-ga -rwxr-xr-x 1 root root 1754608 Sep 27 16:13 qemu-img -rwxr-xr-x 1 root root 1710064 Sep 27 16:13 qemu-io -rwxr-xr-x 1 root root 1714608 Sep 27 16:13 qemu-nbd -rwxr-xr-x 1 root root 595672 Sep 27 16:13 qemu-pr-helper -rwxr-xr-x 1 root root 15031256 Sep 27 16:13 qemu-system-i386 -rwxr-xr-x 1 root root 15069784 Sep 27 16:13 qemu-system-x86_64 -rwxr-xr-x 1 root root 26848 Sep 27 16:13 virtfs-proxy-helper

[vint66]

Hi Jeremy,

Here is the debug. GNS3 server doesn't even look into my desired directory

Environment: PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/opt/qemu/qemu-4.1/bin:/snap/bin

GNS3 Server debug: 2019-10-05 17:57:49 DEBUG compute.py:509 Attempting request to compute: GET http://127.0.0.1:3080/v2/compute/qemu/binaries {'content-type': 'application/json'} 2019-10-05 17:57:49 DEBUG init.py:147 Searching for Qemu binaries in '/bin' 2019-10-05 17:57:49 DEBUG init.py:147 Searching for Qemu binaries in '/usr/sbin' 2019-10-05 17:57:49 DEBUG init.py:147 Searching for Qemu binaries in '/usr/local/bin' 2019-10-05 17:57:49 DEBUG init.py:147 Searching for Qemu binaries in '/usr/bin' 2019-10-05 17:57:49 DEBUG init.py:147 Searching for Qemu binaries in '/sbin' 2019-10-05 17:57:49 DEBUG init.py:147 Searching for Qemu binaries in '/' 2019-10-05 17:57:49 DEBUG init.py:147 Searching for Qemu binaries in '/usr/local/sbin' 2019-10-05 17:57:49 INFO response.py:58 GET /v2/compute/qemu/binaries 2019-10-05 17:57:49 DEBUG response.py:59 {'Host': '127.0.0.1:3080', 'Content-Type': 'application/json', 'Accept': '/', 'Accept-Encoding': 'gzip, deflate', 'User-Agent': 'Python/3.6 aiohttp/3.5.4', 'Authorization': 'Basic =='} 2019-10-05 17:57:49 DEBUG response.py:61 {} 2019-10-05 17:57:49 INFO response.py:62 Response: 200 OK 2019-10-05 17:57:49 DEBUG response.py:63 {'Connection': 'close', 'X-Route': '/v2/compute/qemu/binaries', 'Server': 'Python/3.6 GNS3/2.2.0', 'Content-Type': 'application/json'} 2019-10-05 17:57:49 DEBUG response.py:65 [{'path': '/usr/bin/qemu-system-x86_64', 'version': '2.11.1'}, {'path': '/usr/bin/qemu-system-i386', 'version': '2.11.1'}] 2019-10-05 17:57:49 INFO web_log.py:233 127.0.0.1 [05/Oct/2019:17:57:49 +0000] "GET /v2/compute/qemu/binaries HTTP/1.1" 200 371 "-" "Python/3.6 aiohttp/3.5.4" 2019-10-05 17:57:49 INFO response.py:58 GET /v2/computes/local/qemu/binaries 2019-10-05 17:57:49 DEBUG response.py:59 {'Host': '1.1.1.1:3080', 'Authorization': 'Basic ==', 'User-Agent': 'GNS3 QT Client v2.2.0', 'Connection': 'Keep-Alive', 'Accept-Encoding': 'gzip, deflate', 'Accept-Language': 'en-US,*'} 2019-10-05 17:57:49 DEBUG response.py:61 {} 2019-10-05 17:57:49 INFO response.py:62 Response: 200 OK 2019-10-05 17:57:49 DEBUG response.py:63 {'Connection': 'close', 'X-Route': '/v2/computes/{compute_id}/{emulator}/{action:.+}', 'Server': 'Python/3.6 GNS3/2.2.0', 'Content-Type': 'application/json'} 2019-10-05 17:57:49 DEBUG response.py:65 [{'path': '/usr/bin/qemu-system-x86_64', 'version': '2.11.1'}, {'path': '/usr/bin/qemu-system-i386', 'version': '2.11.1'}] 2019-10-05 17:57:49 INFO web_log.py:233 10.19.197.149 [05/Oct/2019:17:57:49 +0000] "GET /v2/computes/local/qemu/binaries HTTP/1.1" 200 394 "-" "GNS3 QT Client v2.2.0"

[grossmj]

How have you install GNS3 on your remote server? Is GNS3 started by systemd?

[grossmj]

I think I found the problem is because systemd doesn't pass the PATH environment variable to GNS3.

To change that, add the Environment variable to /lib/systemd/system/gns3.service

The file should look like this:

[Unit]
Description=GNS3 server

[Service]
Type=forking
User=gns3
Group=gns3
PermissionsStartOnly=true
Environment="PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/qemu/qemu-4.1/bin/"
ExecStartPre=/bin/mkdir -p /var/log/gns3 /var/run/gns3
ExecStartPre=/bin/chown -R gns3:gns3 /var/log/gns3 /var/run/gns3
ExecStart=/usr/local/bin/gns3server --log /var/log/gns3/gns3.log --logcompression \
 --pid /var/run/gns3/gns3.pid --daemon
Restart=on-abort
PIDFile=/var/run/gns3/gns3.pid

[Install]
WantedBy=multi-user.target

Then restart the systemd service:

sudo systemctl daemon-reload
sudo systemctl restart gns3.service

Let me know if this solves the problem on your side.

[vint66]

Hi Jeremy,

Thank you so much for looking into this. Yes, it appears issue with systemd rather with GNS3. I apologies for misbug.

[grossmj]

Thanks for the confirmation.

I have added a default Environment for GNS3 service. Please update the VM and edit that file as described above if you want to add custom paths.