73 lines
1.9 KiB
Markdown
73 lines
1.9 KiB
Markdown
#Using `sed` to modify a DNS zone
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Take the following DNS zone as an example, say we needed to update the IP address from 110.232.142.185 to 45.65.88.152, you could modify the file using a text editor (see [editors](/commands#editors))
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```
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$TTL 86400
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@ IN SOA ns1.benjamyn.love. servers.benjamyn.love. (
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2018043009 ;Serial
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3600 ;Refresh
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1800 ;Retry
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604800 ;Expire
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43200 ;Minimum TTL
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)
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;Name Server Information
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@ IN NS ns1.benjamyn.love.
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@ IN NS ns2.benjamyn.love.
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;IP address of Name Server
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primary IN A 110.232.142.184
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;A - Record HostName To Ip Address
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memes.sh. IN A 110.232.142.185
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www IN A 110.232.142.185
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;CNAME record
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ftp IN CNAME memes.sh.
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```
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In this case we can just use `sed -i s/110.232.142.185/45.65.88.152/g filename`
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The file gets changed to
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```
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$TTL 86400
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@ IN SOA ns1.benjamyn.love. servers.benjamyn.love. (
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2018043009 ;Serial
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3600 ;Refresh
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1800 ;Retry
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604800 ;Expire
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43200 ;Minimum TTL
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)
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;Name Server Information
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@ IN NS ns1.benjamyn.love.
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@ IN NS ns2.benjamyn.love.
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;IP address of Name Server
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primary IN A 110.232.142.184
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;A - Record HostName To Ip Address
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memes.sh. IN A 45.65.88.152 <--
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www IN A 45.65.88.152 <--
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;CNAME record
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ftp IN CNAME memes.sh.
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```
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You can also use sed to update things like the serial number using some regex (which will need to be incremented for the DNS zone to be properly synced out)
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The command will look like `sed -i s/.*Serial/" 2019010308 ;Serial"/g filename` (The quotes are to escape the ; character) and when run against the DNS zone it will update will look like
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```
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$TTL 86400
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@ IN SOA ns1.benjamyn.love. servers.benjamyn.love. (
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2019010308 ;Serial <--
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3600 ;Refresh
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1800 ;Retry
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604800 ;Expire
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43200 ;Minimum TTL
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)
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;Name Server Information
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@ IN NS ns1.benjamyn.love.
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@ IN NS ns2.benjamyn.love.
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;IP address of Name Server
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primary IN A 110.232.142.184
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;A - Record HostName To Ip Address
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memes.sh. IN A 45.65.88.152
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www IN A 45.65.88.152
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;CNAME record
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ftp IN CNAME memes.sh.
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``` |