The CouchDB Clustering Setup Reference indicates that if you need to limit the range of ephemeral ports used by CouchDB clusters you need to modify the sys.config to add {inet_dist_listen_min, xxxx} and {inet_dist_listen_max, xxxx} entries such as:
[
{lager, [
{error_logger_hwm, 1000},
{error_logger_redirect, true},
{handlers, [
{lager_console_backend, [debug, {
lager_default_formatter,
[
date, " ", time,
" [", severity, "] ",
node, " ", pid, " ",
message,
"\n"
]
}]}
]},
{inet_dist_listen_min, 9100},
{inet_dist_listen_max, 9200}
]}
].
but lager and its dependencies were removed and these entries look to be part of what looks like an array or list of entries associated with lager.
lager, I believe is some logging tool, so I'm a little perplexed. Am I just misreading the settings and I should just these entries in the root array or now that lager is gone can I simply skip this?
What worked for me was to put in the whole configuration as described in the document even though the wording points to just inserting the inet_dist_listen_min and inet_dist_listen_max.
So replace []. with:
[
{lager, [
{error_logger_hwm, 1000},
{error_logger_redirect, true},
{handlers, [
{lager_console_backend, [debug, {
lager_default_formatter,
[
date, " ", time,
" [", severity, "] ",
node, " ", pid, " ",
message,
"\n"
]
}]}
]},
{inet_dist_listen_min, 9100},
{inet_dist_listen_max, 9200}
]}
].
Note that the port range indicated there is from the docs but these are not in the recommended range for ephemeral ports which IANA puts at 49152 to 65535.