netstat deprecated and not available on some centos 7 distributions

[TylerJewell]

When doing a default installation of Codenvy OnPrem for google cloud with their centos 7 node, we got a series of errors.

/dev/fd/63: line 902: netstat: command not found

Upon investigation, netstat is not installed by default. Further investigation shows this command is the error.

echo $(netstat -ano | egrep LISTEN | egrep tcp | egrep ":80\s")

The solution is to replace netstat -ano with ss -a. See more details here:
https://dougvitale.wordpress.com/2011/12/21/deprecated-linux-networking-commands-and-their-replacements/#netstat

[dmytro-ndp]

@TylerJewell: take into account that requesting ss command through ssh producing an error 'command not found':

$ ssh -o StrictHostKeyChecking=no -i /home/$USER/.vagrant.d/insecure_private_key vagrant@192.168.56.110 "ss"
bash: ss: command not found

It is needed to add '. /etc/profile' when calling ss, or bootsrtap script which uses ss:
$ ssh -o StrictHostKeyChecking=no -i /home/$USER/.vagrant.d/insecure_private_key vagrant@192.168.56.110 ". /etc/profile && ss"

Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
u_str ESTAB 0 0 /var/run/postgresql/.s.PGSQL.5432 2773621 * 2774316
u_str ESTAB 0 0 * 2316468 * 2316469
...