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Dynamic DNS updater using AWS Route53

License: The Unlicense

Shell 90.49% Dockerfile 9.51%

aws ddns dns route53

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Not an issue but does this run once or does it auto run on IP change?

Just wondering if this script needs to be manually added to crontab or if it automatically sets itself up to run.

great tool! opendns resolver doesn't work though for me....

So I'm totally unsure why, but the following does not work for me (times out):

dig +short myip.opendns.com @resolver1.opendns.com

It does work fine if I don't specify @resolver1.opendns.com.

For my home purposes I'm just going to leave that part off.

Script behaves differently when ran from cron job vs. shell

If I run the script manually, I get the following output:
Current IP == a.b.c.d

But if running it from cron (piping output to a log file), I get the following:
IP changed from '' to 'a.b.c.d', updating entry
where a.b.c.d is my actual IP.

I added a couple of echo statements in the script inside the main() function and looks like when it's ran from cron, the old_ip variable is blank.

Any thoughts?

Unable to determine current IP address

Seem like the 'opendns' method for fetching external IP address is broken.

I have a proven the following remedy to be working:
Modify ddns-route53, line 73:
ip="$(curl ifconfig.co)" ###ip="$(dig +short myip.opendns.com @resolver1.opendns.com)"

Readme.md should be update to require 'curl' as opposed to 'dig'

Thanks for the great work!

Some region disturb checking ip

script did not work properly from a few days ago.
so, I did check script, and result is follow.

jehos@pi-router:~$ MYIP=$(dig +short myip.opendns.com @resolver1.opendns.com); date; echo $MYIP; geoiplookup $MYIP
Sat Aug 18 00:01:52 CST 2018
74.117.178.155
GeoIP Country Edition: VG, Virgin Islands, British
GeoIP City Edition, Rev 1: VG, 00, N/A, Road Town, N/A, 18.416700, -64.616699, 0, 0
GeoIP ASNum Edition: AS40824 WZ Communications Inc.

jehos@pi-router:~$ MYIP=$(dig +short myip.opendns.com @resolver1.opendns.com); date; echo $MYIP; geoiplookup $MYIP
Sat Aug 18 00:01:53 CST 2018
31.13.87.3
GeoIP Country Edition: IE, Ireland
GeoIP City Edition, Rev 1: IE, N/A, N/A, N/A, N/A, 53.347198, -6.243900, 0, 0
GeoIP ASNum Edition: AS32934 Facebook, Inc.

jehos@pi-router:~$ MYIP=$(dig +short myip.opendns.com @resolver1.opendns.com); date; echo $MYIP; geoiplookup $MYIP
Sat Aug 18 00:01:54 CST 2018
108.160.165.8
GeoIP Country Edition: US, United States
GeoIP City Edition, Rev 1: US, CA, California, San Francisco, 94107, 37.769699, -122.393303, 807, 415
GeoIP ASNum Edition: AS19679 Dropbox, Inc.

jehos@pi-router:~$ MYIP=$(dig +short myip.opendns.com @resolver1.opendns.com); date; echo $MYIP; geoiplookup $MYIP
Sat Aug 18 00:01:55 CST 2018
108.160.170.52
GeoIP Country Edition: US, United States
GeoIP City Edition, Rev 1: US, VA, Virginia, Ashburn, 20149, 39.048100, -77.472801, 511, 703
GeoIP ASNum Edition: AS19679 Dropbox, Inc.

jehos@pi-router:~$ MYIP=$(dig +short myip.opendns.com @resolver1.opendns.com); date; echo $MYIP; geoiplookup $MYIP
Sat Aug 18 00:01:56 CST 2018
128.242.240.116
GeoIP Country Edition: US, United States
GeoIP City Edition, Rev 1: US, CO, Colorado, Englewood, 80111, 39.623699, -104.873802, 751, 303
GeoIP ASNum Edition: AS2914 NTT America, Inc.

It worked well on servers installed in other countries, but it did not work in certain countries.
(see execute time, and result ip)
some country seems to be interfering with IP verification.

this is workaround

diff --git a/ddns-route53 b/ddns-route53
index 3c4b5bf..0ccefea 100755
--- a/ddns-route53
+++ b/ddns-route53
@@ -70,7 +70,8 @@ function init-args() {
     shift
   done
   if [[ -z "$ip" ]]; then
-    ip="$(dig +short myip.opendns.com @resolver1.opendns.com)"
+    #ip="$(dig +short myip.opendns.com @resolver1.opendns.com)"
+    ip="$(curl -s whatismyip.akamai.com)"
   fi
   old_ip="$(fetch-current-ip 2> /dev/null)"
   return 0

but it just workaround.
The script should have some cross validation function..

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