i want to take each host that is in host.list, and run it against the host.conf file. what i'm looking to do is to get the IP of the host from the host.conf file.
in other words, every host that I have in host.list has a configuration set up in host.conf. the configuration set up for each host is the chunk i pasted above.
below is the code im attempting to use to help me pull out what i want.
Code:
awk 'BEGIN {
while((getline < "host.list")>0)
S[$0]
FS="\n"; RS="}\n"
}
/define host/ && /}/ {
for(X in D) delete D[X];
for(N=2; N<=NF; N++)
{
split($N, A, " ");
D[A[1]] = A[2]
i = 3;
while (i in A)
D[A[1]] = D[A[1]] "=" A[i++];
}
if (D["host_name"] in S)
printf("%20s -- %50s\n", D["host_name"], D["address"])
}' $1
the output of this script should be:
Code:
hostname ---- ip
ex:
mail-server01.sky.net ------ 10.11.11.14
I'm no guru, and I'm sure there's a one-liner way to do it with awk or something, but if pressed for time, here's how I would do it in a shell script:
Code:
#!/bin/bash
#first, put each chunk from the host.conf file on a single line of a temp file
#and make sure all delimiters are single spaces, and there are none leading
echo -ne `cat host.conf` | sed 's/}/}\n/g' | sed 's/^ *//;s/ */ /g' > host.conf.searchable
#then read each line from the host.list file one at a time
while read HOSTNAME
do
#check the temp file to see if there is a matching entry in the host.conf file
if [[ -n grep $HOSTNAME host.conf.searchable ]] ; then
#if there is, get the IP field of the matching line
IP=`grep $HOSTNAME host.conf.searchable |cut -d" " -f4`
#and then just spit it out in the required format
echo "$HOSTNAME ----- $IP"
fi
done<host.list
#my mama always told me to clean up after myself
rm host.conf.searchable
exit
I think the awk solution can be a wee bit more simple:
Code:
awk '
NR == FNR { seen[$1]; next } # collect hosts from the conf file
/}/ { # end of chunk, if name was in conf list, print data
if( name in seen )
printf( "%20s ---- %s\n", name, ip );
name = "";
}
/host_name/ { name = $2; next; }
/address/ { ip = $2; next; }
' host.conf chunk-file >output-file
Doesn't assume that elements in the block have a specific order; this is an advantage if chunk file is hand coded.
I think the awk solution can be a wee bit more simple:
Code:
awk '
NR == FNR { seen[$1]; next } # collect hosts from the conf file
/}/ { # end of chunk, if name was in conf list, print data
if( name in seen )
printf( "%20s ---- %s\n", name, ip );
name = "";
}
/host_name/ { name = $2; next; }
/address/ { ip = $2; next; }
' host.conf chunk-file >output-file
Doesn't assume that elements in the block have a specific order; this is an advantage if chunk file is hand coded.
thank you. this is the code i need. it works.
one question, where do you specify the "define host"? how does the script know where to begin?
i ask because in each chunks, there can be two ips set for one host. the ips will be specified by:
Code:
address 10.11.11.45
secondary_address 10.19.19.19
looks like the script only grabs any field that matches "address", when in fact, i need it to grab only the primary address, which is the "10.11.11.45".
---------- Post updated at 01:35 PM ---------- Previous update was at 09:54 AM ----------
It seems the script is grabbing the wrong IPs.
i modified the script to, instead of grabbing the primary ip that is defined in a chunk like this:
Code:
define host {
address 10.11.11.14
alias mail-server
host_name mail-server01.sky.net
use generic-host
}
i modified the script to grab the secondary IP instead. but its not working. it's grabbing ips that dont belong to the chunk of the particular host it is saying it belongs to.
Code:
define host {
alias mail-server
host_name mail-server01.sky.net
_secondary_address 10.11.11.14
use generic-host
}
here's my script, i'm sure its wrong:
Code:
awk '
NR == FNR { seen[$1]; next } # collect hosts from the conf file
/}/ { # end of chunk, if name was in conf list, print data
if( name in seen )
printf( "%20s ---- %s\n", name, ip );
name = "F";
}
/host_name/ { name = $2; next; }
/ _secondary_address/ { ip = $2; next; }
' host.list host.conf
awk '
NR == FNR { seen[$1]; next } # collect hosts from the conf file
/}/ { # end of chunk, if name was in conf list, print data
if( name in seen )
printf( "%20s ---- %s\n", name, ip );
name = "";
}
/secondary_address/ { next; }
/host_name/ { name = $2; next; }
/address/ { ip = $2; next; }
' host.conf chunk-file >output-file
And to answer your original question, the programme doesn't look for define host tags. Given what you posted as the contents of your file it doesn't need to. If there are other 'chunks' that need to be ignored, then it might not do the right thing depending on the contents of thoese chunks.
something like this would help if there are multiple chunks to be ignored:
Code:
awk '
NR == FNR { seen[$1]; next } # collect hosts from the conf file
/define host.*{/ { snarf = 1; next; } # ok to capture data after this point
!snarf { next; } # skip record if not capturing
/}/ { # end of chunk, if name was in conf list, print data
if( name in seen )
printf( "%20s ---- %s\n", name, ip );
name = "";
snarf = 0; # end of chunk turn capture off
}
/secondary_address/ { next; } # ignore secondary address edit: this might need to be /_secondary_address/
/host_name/ { name = $2; next; }
/address/ { ip = $2; next; }
' host.conf chunk-file >output-file
I didn't test this, so it could have a typo, but it looks clean to me.
---------- Post updated at 18:10 ---------- Previous update was at 18:02 ----------
I just reread your last posts and am a bit confused. Is the secondary address marked with secondary_address or does the string have a leading underbar? Given that your programme is looking to capture with the leading underbar, and it's not working, I'm assuming it doesn't have it in the file. The problem might also have been leading whitespace. If the configuration file records don't have any whitespace, or it's tabs and not at least a space, the leading space in your pattern (/ _secondary_address/ could be your problem too. It's hard to tell since you only posted bits and pieces of your config file.
I hope this makes some sense, and that some of it gets you going again.
Last edited by agama; 05-16-2012 at 07:11 PM..
Reason: added comment
awk '
NR == FNR { seen[$1]; next } # collect hosts from the conf file
/}/ { # end of chunk, if name was in conf list, print data
if( name in seen )
printf( "%20s ---- %s\n", name, ip );
name = "";
}
/secondary_address/ { next; }
/host_name/ { name = $2; next; }
/address/ { ip = $2; next; }
' host.conf chunk-file >output-file
And to answer your original question, the programme doesn't look for define host tags. Given what you posted as the contents of your file it doesn't need to. If there are other 'chunks' that need to be ignored, then it might not do the right thing depending on the contents of thoese chunks.
something like this would help if there are multiple chunks to be ignored:
Code:
awk '
NR == FNR { seen[$1]; next } # collect hosts from the conf file
/define host.*{/ { snarf = 1; next; } # ok to capture data after this point
!snarf { next; } # skip record if not capturing
/}/ { # end of chunk, if name was in conf list, print data
if( name in seen )
printf( "%20s ---- %s\n", name, ip );
name = "";
snarf = 0; # end of chunk turn capture off
}
/secondary_address/ { next; } # ignore secondary address edit: this might need to be /_secondary_address/
/host_name/ { name = $2; next; }
/address/ { ip = $2; next; }
' host.conf chunk-file >output-file
I didn't test this, so it could have a typo, but it looks clean to me.
---------- Post updated at 18:10 ---------- Previous update was at 18:02 ----------
I just reread your last posts and am a bit confused. Is the secondary address marked with secondary_address or does the string have a leading underbar? Given that your programme is looking to capture with the leading underbar, and it's not working, I'm assuming it doesn't have it in the file. The problem might also have been leading whitespace. If the configuration file records don't have any whitespace, or it's tabs and not at least a space, the leading space in your pattern (/ _secondary_address/ could be your problem too. It's hard to tell since you only posted bits and pieces of your config file.
I hope this makes some sense, and that some of it gets you going again.
thank you so much.
this works:
Code:
awk '
NR == FNR { seen[$1]; next } # collect hosts from the conf file
/define host.*{/ { snarf = 1; next; } # ok to capture data after this point
!snarf { next; } # skip record if not capturing
/}/ { # end of chunk, if name was in conf list, print data
if( name in seen )
printf( "%20s ---- %s\n", name, ip );
name = "";
snarf = 0; # end of chunk turn capture off
}
/_secondary_address/ { next; } # ignore secondary address edit: this might need to be /_secondary_address/
/host_name/ { name = $2; next; }
/address/ { ip = $2; next; }
i just need one last thing. i need to modify this code to not spit out both the ips for address and _secondary address. so i dont want to ignore secondary address anymore. i want this code to spit out something like this:
Code:
sky.net ---- 10.11.11.11 ---- 10.12.12.12
in this case of course, the first ip will be the ip provided for "address", and the second ip will be the one provided for "_secondary_address".
So I'm stumped.
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05-16-2012
