As in the cycle to replace the name of all containers on their ip?

Question

As in the cycle to replace the name of all containers on their ip?

There are containers

CTID NPROC STATUS IP_ADDR HOSTNAME
 101 19 running 127.0.0.2 test1
 102 19 running 127.0.0.3 test2

You need to assign a hostname .= the ip of the container
You can make your hands in the form :
vzctl set 101 --hostname "127.0.0.2" --save

Choose the required field is id and ip, but this is the line, how to separate while loop?

jana95 asked March 19th 20 at 08:36

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2 answers

Jaleel_Glover29 answered on · Answer 1 · 2020-03-19T07:38:22.104Z

Jaleel_Glover29 answered on March 19th 20 at 08:38

awk '{print $1, $4}'

@Jaleel_Glover29
I probably do not say so
you can choose a -o ctid,ip
the point is how to use them in a loop for each of the next id to assign his ip to hostname
``
for CT in $(vzlist -H -o ctid); do echo "== CT $CT =="; vzctl exec $CT uptime; done
``
Only use id, and need id + ip - jana95 commented on March 19th 20 at 08:41

@jana95, then it is not clear what the difficulty is. Sorted turns of line in a loop, adding the data you need into variables and then performing the desired command. This can be done easily in bash with a combination of IFS and read.

https://bash.cyberciti.biz/guide/$IFS
tldp.org/LDP/Bash-Beginners-Guide/html/sect_08_02.html - Jaleel_Glover29 commented on March 19th 20 at 08:44

Alana.Larkin44 answered on · Answer 2 · 2020-03-19T07:40:22.104Z

For example, using a temporary file.
vzlist -H -o ctid | awk ' { print "vzctl set" $1 , " --hostname \"" $4 "\" --save" }' > /tmp/cmd
Check out what happened in the /tmp/cmd
If all goes well, then execute it:
sh /tmp/cmd