# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.
# Each node in the system must have a unique name. These are specified through
# the Erlang -name flag, which takes the form:
#
# -name nodename@<FQDN>
#
# or
#
# -name nodename@<IP-ADDRESS>
#
# CouchDB recommends the following values for this flag:
#
# 1. If this is a single node, not in a cluster, use:
# -name couchdb@127.0.0.1
#
# 2. If DNS is configured for this host, use the FQDN, such as:
# -name couchdb@my.host.domain.com
#
# 3. If DNS isn't configured for this host, use IP addresses only, such as:
# -name couchdb@192.168.0.1
#
# Do not rely on tricks with /etc/hosts or libresolv to handle anything
# other than the above 3 approaches correctly. They will not work reliably.
#
# Multiple CouchDBs running on the same machine can use couchdb1@, couchdb2@,
# etc.
-name couchdb@127.0.0.1
# All nodes must share the same magic cookie for distributed Erlang to work.
# Uncomment the following line and append a securely generated random value.
-setcookie XXX
# Which interfaces should the node listen on?
-kernel inet_dist_use_interface {127,0,0,1}
# Tell kernel and SASL not to log anything
-kernel error_logger silent
-sasl sasl_error_logger false
# Use kernel poll functionality if supported by emulator
+K true
# Start a pool of asynchronous IO threads
+A 16
# Comment this line out to enable the interactive Erlang shell on startup
+Bd -noinput
# Force use of the smp scheduler, fixes #1296
-smp enable
# Set maximum SSL session lifetime to reap terminated replication readers
-ssl session_lifetime 300
## TLS Distribution
## Use TLS for connections between Erlang cluster members.
## http://erlang.org/doc/apps/ssl/ssl_distribution.html
##
## Generate Cert(PEM) File
## This is just an example command to generate a certfile (PEM).
## This is not an endorsement of specific expiration limits, key sizes, or algorithms.
## $ openssl req -newkey rsa:2048 -new -nodes -x509 -days 3650 -keyout key.pem -out cert.pem
## $ cat key.pem cert.pem > dev/erlserver.pem && rm key.pem cert.pem
##
## Generate a Config File (couch_ssl_dist.conf)
## [{server,
## [{certfile, "</path/to/erlserver.pem>"},
## {secure_renegotiate, true}]},
## {client,
## [{secure_renegotiate, true}]}].
##
## CouchDB recommends the following values for no_tls flag:
## 1. Use TCP only, set to true, such as:
## -couch_dist no_tls true
## 2. Use TLS only, set to false, such as:
## -couch_dist no_tls false
## 3. Specify which node to use TCP, such as:
## -couch_dist no_tls \"*@127.0.0.1\"
##
## To ensure search works, make sure to set 'no_tls' option for the clouseau node.
## By default that would be "clouseau@127.0.0.1".
## Don't forget to override the paths to point to your certificate(s) and key(s)!
##
#-proto_dist couch
#-couch_dist no_tls \"clouseau@127.0.0.1\"
#-ssl_dist_optfile <path/to/couch_ssl_dist.conf>

dietpi@DietPi:~$ strace -e bind epmd -d -address 127.0.0.1
strace: Can't stat 'epmd': No such file or directory

dietpi@DietPi:/opt/couchdb/erts-11.2.2.9/bin$ strace -e bind ./epmd -d -address 127.0.0.1
epmd: Tue Apr 26 09:51:35 2022: epmd running - daemon = 0
bind(3, {sa_family=AF_INET, sin_port=htons(4369), sin_addr=inet_addr("127.0.0.1")}, 16) = 0
bind(4, {sa_family=AF_INET6, sin6_port=htons(4369), sin6_flowinfo=htonl(0), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_scope_id=0}, 28) = -1 EADDRNOTAVAIL (Cannot assign requested address)
epmd: Tue Apr 26 09:51:35 2022: failed to bind on ipaddr 127.0.0.1: Cannot assign requested address
+++ exited with 1 +++

dietpi@DietPi:/opt/couchdb/erts-11.2.2.9/bin$ strace -e bind ./epmd -d -address 0.0.0.0
epmd: Tue Apr 26 09:53:10 2022: epmd running - daemon = 0
bind(3, {sa_family=AF_INET, sin_port=htons(4369), sin_addr=inet_addr("127.0.0.1")}, 16) = 0
bind(4, {sa_family=AF_INET6, sin6_port=htons(4369), sin6_flowinfo=htonl(0), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_scope_id=0}, 28) = -1 EADDRNOTAVAIL (Cannot assign requested address)
epmd: Tue Apr 26 09:53:10 2022: failed to bind on ipaddr [REDACTED]: Cannot assign requested address
+++ exited with 1 +++

dietpi@DietPi:/opt/couchdb/erts-11.2.2.9/bin$ strace -e bind ./epmd -d -port 4370 -address 127.0.0.1
epmd: Tue Apr 26 09:54:31 2022: epmd running - daemon = 0
bind(3, {sa_family=AF_INET, sin_port=htons(4370), sin_addr=inet_addr("127.0.0.1")}, 16) = 0
bind(4, {sa_family=AF_INET6, sin6_port=htons(4370), sin6_flowinfo=htonl(0), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_scope_id=0}, 28) = -1 EADDRNOTAVAIL (Cannot assign requested address)
epmd: Tue Apr 26 09:54:31 2022: failed to bind on ipaddr 127.0.0.1: Cannot assign requested address
+++ exited with 1 +++