{"id":1658,"date":"2014-12-16T19:35:44","date_gmt":"2014-12-16T19:35:44","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=1658"},"modified":"2025-06-13T23:52:53","modified_gmt":"2025-06-14T06:52:53","slug":"iptables-firewall-settings-couchbase-db-and-couchbase-mobile-syncgateway","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/iptables-firewall-settings-couchbase-db-and-couchbase-mobile-syncgateway\/","title":{"rendered":"IPTables Firewall Settings for Couchbase DB and Couchbase Mobile Sync_gateway"},"content":{"rendered":"

It is all too common for people to just turn off IPtables instead of actually figuring out what ports to open. I have to admit I have done it myself. Well we need to stop that. IPtables is our\u00a0friend, really. To that end, here is the body of a script you can use to configure IPtables.<\/p>\n\n\n\n
# Couchbase DB Server Ports
\n\t\t\tiptables -A INPUT -p tcp -m state –state NEW -m tcp –dport 4369 -j ACCEPT
\n\t\t\tiptables -A INPUT -p tcp -m state –state NEW -m tcp –dport 8091 -j ACCEPT
\n\t\t\tiptables -A INPUT -p tcp -m state –state NEW -m tcp –dport 8092 -j ACCEPT
\n\t\t\tiptables -A INPUT -p tcp -m state –state NEW -m tcp –dport 11209 -j ACCEPT
\n\t\t\tiptables -A INPUT -p tcp -m state –state NEW -m tcp –dport 11210 -j ACCEPT
\n\t\t\tiptables -A INPUT -p tcp -m state –state NEW -m tcp –dport 11211 -j ACCEPT
\n\t\t\tiptables -A INPUT -p tcp -m state –state NEW -m tcp –dport 11214 -j ACCEPT
\n\t\t\tiptables -A INPUT -p tcp -m state –state NEW -m tcp –dport 11215 -j ACCEPT
\n\t\t\tiptables -A INPUT -p tcp -m state –state NEW -m tcp –dport 18091 -j ACCEPT
\n\t\t\tiptables -A INPUT -p tcp -m state –state NEW -m tcp –dport 18092 -j ACCEPT<\/em>
\n\t\t\tiptables -A INPUT -p tcp -m state –state NEW -m tcp –dport 21100:21199 -j ACCEPT<\/em>
\n\t\t\t\u00a0<\/p>\n

# Couchbase sync_gateway ports
\n\t\t\tiptables -A INPUT -p tcp -m state –state NEW -m tcp –dport 4984 -j ACCEPT<\/em><\/p>\n

\t\t\t <\/em><\/p>\n

# If you want to open the sync_gateway service's admin interface to outside traffic:
\n\t\t\tiptables -A INPUT -p tcp -m state –state NEW -m tcp –dport 4985 -j ACCEPT<\/em><\/p>\n

# When you are done adding those, you want to run the following two commands to make sure the REJECT is
\n\t\t\t#\u00a0<\/em>at the end of the chain. Otherwise things will not work. The first one deletes it and the second adds it back in.
\n\t\t\t# The reason for this is otherwise we have to get into line numbers of the chain and that is harder to explain
\n\t\t\t#\u00a0<\/em>if you are not familiar with IPTables.<\/em><\/p>\n

iptables -D INPUT -j REJECT –reject-with icmp-host-prohibited
\n\t\t\tiptables -A INPUT -j REJECT –reject-with icmp-host-prohibited???<\/em>
\n\t\t\t\u00a0<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Check to make sure they are all in correctly by running as root `iptables –list`. It should look something like this:<\/span><\/p>\n\n\n\n
\n

# iptables –list
\n\t\t\tChain INPUT (policy ACCEPT)
\n\t\t\ttarget \u00a0 \u00a0 prot opt source \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 destination \u00a0 \u00a0 \u00a0 \u00a0\u00a0
\n\t\t\tACCEPT \u00a0 \u00a0 all \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0state RELATED,ESTABLISHED\u00a0
\n\t\t\tACCEPT \u00a0 \u00a0 icmp — \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0
\n\t\t\tACCEPT \u00a0 \u00a0 all \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0
\n\t\t\tACCEPT \u00a0 \u00a0 tcp \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0state NEW tcp dpt:ssh\u00a0
\n\t\t\tACCEPT \u00a0 \u00a0 tcp \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0state NEW tcp dpt:epmd\u00a0
\n\t\t\tACCEPT \u00a0 \u00a0 tcp \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0state NEW tcp dpt:jamlink\u00a0
\n\t\t\tACCEPT \u00a0 \u00a0 tcp \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0state NEW tcp dpt:8092\u00a0
\n\t\t\tACCEPT \u00a0 \u00a0 tcp \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0state NEW tcp dpt:11209\u00a0
\n\t\t\tACCEPT \u00a0 \u00a0 tcp \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0state NEW tcp dpt:11210\u00a0
\n\t\t\tACCEPT \u00a0 \u00a0 tcp \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0state NEW tcp dpt:memcache\u00a0
\n\t\t\tACCEPT \u00a0 \u00a0 tcp \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0state NEW tcp dpt:11214\u00a0
\n\t\t\tACCEPT \u00a0 \u00a0 tcp \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0state NEW tcp dpt:11215\u00a0
\n\t\t\tACCEPT \u00a0 \u00a0 tcp \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0state NEW tcp dpt:18091\u00a0
\n\t\t\tACCEPT \u00a0 \u00a0 tcp \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0state NEW tcp dpt:18092\u00a0
\n\t\t\tACCEPT \u00a0 \u00a0 tcp \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0state NEW tcp dpt:webyast
\n\t\t\tREJECT \u00a0 \u00a0 all \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0reject-with icmp-host-prohibited<\/em><\/p>\n

Chain FORWARD (policy ACCEPT)
\n\t\t\ttarget \u00a0 \u00a0 prot opt source \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 destination \u00a0 \u00a0 \u00a0 \u00a0\u00a0
\n\t\t\tREJECT \u00a0 \u00a0 all \u00a0— \u00a0anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 anywhere \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0reject-with icmp-host-prohibited\u00a0<\/em><\/p>\n

Chain OUTPUT (policy ACCEPT)
\n\t\t\ttarget \u00a0 \u00a0 prot opt source \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 destination<\/em><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Just remember to save this config once you have it in place (`service iptables save`). Also, you need\u00a0to confirm that the REJECT for the INPUT chain is at the end. Otherwise you will reject any traffic to ports\u00a0listed below that REJECT.<\/p>\n

Just remember that this is local server security only! It does NOT<\/strong> take the place of a network firewall or AWS security groups\/network\u00a0ACLs. You really should use both.<\/span><\/p>\n

If you would like more information on network ports, please see the\u00a0Couchbase Admin documentation<\/a>\u00a0or the Couchbase mobile documentation.<\/p>\n

There are no warranties, expressly or implied in this blog post, for IPTables or these settings. You have to do your own due dilligence when it comes to your system's security. So use good sense here, please.<\/p>\n","protected":false},"excerpt":{"rendered":"

It is all too common for people to just turn off IPtables instead of actually figuring out what ports to open. I have to admit I have done it myself. Well we need to stop that. IPtables is our\u00a0friend, really. […]<\/p>\n","protected":false},"author":23,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1813],"tags":[1352,1355],"ppma_author":[9008],"class_list":["post-1658","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security","tag-linux","tag-operations"],"acf":[],"yoast_head":"\nIPTables Firewall Settings for Couchbase DB and Couchbase Mobile Sync_gateway - The Couchbase Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.couchbase.com\/blog\/iptables-firewall-settings-couchbase-db-and-couchbase-mobile-syncgateway\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"IPTables Firewall Settings for Couchbase DB and Couchbase Mobile Sync_gateway\" \/>\n<meta property=\"og:description\" content=\"It is all too common for people to just turn off IPtables instead of actually figuring out what ports to open. 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