Notes for frequently encountered problems

While editing VNF package in OSM, make sure no NS package is referencing to VNF package else it may produce errors and won't let you edit the file sometimes. --Harshita

On executing tango bench experiments, faced few configuration errors while connecting from local to Backflip1. Updating the ansible package helped in this case. --Suganthi

Unzip .tar.gz file: tar zxvf FILE_NAME
Zip folder to .tar.gz file: tar -czvf TAR_FILE_NAME.tar.gz FOLDER_NAME --Bhuvan

Ways to have additional interfaces working:

• cloud-init script to get list of available ports (or if you know what would be the names of interfaces) and run dhclient INTERFACE: will make it temporarily up. Workaround: use bootcmd instead of runcmd in cloud-init file.
• cloud-init script to get list of available ports (or if you know what would be the names of interfaces) and add that interface in /etc/network/interfaces.d/50-cloud-init.cfg in image (preload) or in deployed VM (afterload). [USED IN OUR IMPLEMENTATION WITH AUTOMATION - https://github.com/CN-UPB/tng-sdk-benchmark/issues/9#issuecomment-539397032]
  --Bhuvan You might get some of these errors when importing the new tng bench code.

1. If you find anything like “fatal-error”, below commands would help. • sudo apt install python-pip libcurl4-gnutls-dev libgnutls-dev • sudo yum install python-pip libcurl-devel gnutls-devel • sudo -H pip install python-magic
2. If you still find errors, when u tried the above commands, like as below, “E: Package 'libgnutls-dev' has no installation candidate E: Package 'libgnutls-dev' has no installation candidate Package libgnutls-dev is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source”
3. Try the below command for searching the lib, • apt search libgnutls
4. If you find below errors, while installing tngbench “ERROR: Could not find a version that satisfies the requirement osmclient (from versions: none) ERROR: No matching distribution found for osmclient” Then, Clone the osmclient repo and install OSM client from the git repo. • git clone https://osm.etsi.org/gerrit/osm/osmclient • sudo -H pip install osmclient https://github.com/CN-UPB/pg-backflip/wiki/Infrastructure-Info
5. When you try to test your tngbench connection using ansible, make sure that your hosts.yml is in the below format. -- vim-emu-nodes: hosts: fgcn-backflip1.cs.upb.de vars: ansible_user: tngbench ansible_password: ******** #optional

--Suganthi