rsync "connection refused" error - rsync

Question

I'm getting crazy with rsync which gives me a "connection refused" error. Here's my problem:
I have two servers, used to store datas, with rsync installed on because I need that both servers stay synchronized. In this way, modifies on one server will cause the same modifies on the other and viceversa. The first node (sn1) works while the second (sn2) do not. In details.
- sn1 has 192.168.13.131 as ip address
- sn2 has 192.168.13.132 as ip address
If I give rsync rsync://192.168.13.131 from sn1 or sn2, it works fine; while if I give rsync rsync://182.168.13.132 from sn1 or sn2, I get this error:
rsync: failed to connect to 192.168.13.132 (192.168.13.132): Connection refused (111)
rsync error: error in socket IO (code 10) at clientserver.c(125) [Receiver=3.1.2]
Here's some information about sn2.
/etc/rsyncd.conf
uid = swift
gid = swift
log file = /var/log/rsyncd.log
pid file = /var/run/rsyncd.pid
address = 192.168.130.132
[account]
max connections = 20
path = /srv/node/
read only = False
lock file = /var/lock/account.lock
[container]
max connections = 20
path = /srv/node/
read only = False
lock file = /var/lock/container.lock
[object]
max connections = 20
path = /srv/node/
read only = False
lock file = /var/lock/object.lock
and /etc/default/rsync
# defaults file for rsync daemon mode
#
# This file is only used for init.d based systems!
# If this system uses systemd, you can specify options etc. for rsync
# in daemon mode by copying /lib/systemd/system/rsync.service to
# /etc/systemd/system/rsync.service and modifying the copy; add required
# options to the ExecStart line.
# start rsync in daemon mode from init.d script?
# only allowed values are "true", "false", and "inetd"
# Use "inetd" if you want to start the rsyncd from inetd,
# all this does is prevent the init.d script from printing a message
# about not starting rsyncd (you still need to modify inetd's config yourself).
RSYNC_ENABLE=true
# which file should be used as the configuration file for rsync.
# This file is used instead of the default /etc/rsyncd.conf
# Warning: This option has no effect if the daemon is accessed
# using a remote shell. When using a different file for
# rsync you might want to symlink /etc/rsyncd.conf to
# that file.
# RSYNC_CONFIG_FILE=
# what extra options to give rsync --daemon?
# that excludes the --daemon; that's always done in the init.d script
# Possibilities are:
# --address=123.45.67.89 (bind to a specific IP address)
# --port=8730 (bind to specified port; default 873)
RSYNC_OPTS=''
# run rsyncd at a nice level?
# the rsync daemon can impact performance due to much I/O and CPU usage,
# so you may want to run it at a nicer priority than the default priority.
# Allowed values are 0 - 19 inclusive; 10 is a reasonable value.
RSYNC_NICE=''
# run rsyncd with ionice?
# "ionice" does for IO load what "nice" does for CPU load.
# As rsync is often used for backups which aren't all that time-critical,
# reducing the rsync IO priority will benefit the rest of the system.
# See the manpage for ionice for allowed options.
# -c3 is recommended, this will run rsync IO at "idle" priority. Uncomment
# the next line to activate this.
# RSYNC_IONICE='-c3'
# Don't forget to create an appropriate config file,
# else the daemon will not start.
Now some logs. /var/log/rsyncd.log
2018/05/04 15:10:16 [889] rsyncd version 3.1.2 starting, listening on port 873
2018/05/04 15:10:16 [889] bind() failed: Cannot assign requested address (address-family 2)
2018/05/04 15:10:16 [889] unable to bind any inbound sockets on port 873
2018/05/04 15:10:16 [889] rsync error: error in socket IO (code 10) at socket.c(555) [Receiver=3.1.2]
Output of ps aux | grep rsync command on sn2:
sn2 1555 0.0 0.1 13136 1060 pts/0 S+ 15:46 0:00 grep --color=auto rsync
Output of ps aux | grep rsync command on sn1:
sn1 12875 0.0 0.1 13136 1012 pts/0 S+ 15:48 0:00 grep --color=auto rsync
root 21281 0.0 0.2 12960 2800 ? Ss 13:31 0:00 /usr/bin/rsync --daemon --no-detach
This is the main difference I see between the two nodes.
Output of the command sudo systemctl status rsync on sn1:
rsync.service - fast remote file copy program daemon
Loaded: loaded (/lib/systemd/system/rsync.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2018-05-04 13:31:10 UTC; 2h 19min ago
Main PID: 21281 (rsync)
Tasks: 1 (limit: 1113)
CGroup: /system.slice/rsync.service
└─21281 /usr/bin/rsync --daemon --no-detach
May 04 13:31:10 sn1 systemd[1]: Started fast remote file copy program daemon.
Output of the same command in sn2:
rsync.service - fast remote file copy program daemon
Loaded: loaded (/lib/systemd/system/rsync.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Fri 2018-05-04 15:10:16 UTC; 41min ago
Process: 889 ExecStart=/usr/bin/rsync --daemon --no-detach (code=exited, status=10)
Main PID: 889 (code=exited, status=10)
May 04 15:10:15 sn2 systemd[1]: Started fast remote file copy program daemon.
May 04 15:10:16 sn2 systemd[1]: rsync.service: Main process exited, code=exited, status=10/n/a
May 04 15:10:16 sn2 systemd[1]: rsync.service: Failed with result 'exit-code'.
Output of the command sudo netstat -lptu | grep rsync on sn1:
tcp 0 0 sn1:rsync 0.0.0.0:* LISTEN 21281/rsync
while in sn2 it returns nothing...
Finally the sn2 /etc/hosts containt
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
#ADDED BY ME
#10.0.2.15 sn2
192.168.13.130 proxy-server
192.168.13.131 sn1
192.168.13.132 sn2
#192.168.13.133 sn3
#192.168.13.134 sn4
# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
And sn1 as well:
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
#ADDED BY ME
#10.0.2.15 sn1
192.168.13.130 proxy-server
192.168.13.131 sn1
192.168.13.132 sn2
#192.168.13.133 sn3
#192.168.13.134 sn4
# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
I'm running ubuntu 18.04 in each server node, on a virtual machine.
Can you help me to figure out what is happening? Unfortunately I must use rsync because I'm working on OpenStack Swift, so no change are allowed :)

Answer 1

Ok, I've done. It was simply, just gain super user privilege and then enable and start rsync process:
sudo su
enter your password, then digit
systemctl enable rsync
systemctl start rsync
if you don't have a systemctl based terminal just use "service" instead.
service rsync restart
You can check that rsync is now working by accessing to /var/log/rsyncd.log. The bind() error is now gone.

Answer 2

With default config, I always do rsync -rtP /home/me/source/ x.x.x.x:/home/someoneelse/source (where x.x.x.x is an actual IP address). I am not aware when or if rsync:// would ever need to be specified as the protocol. In my case, I had your error until I enabled sshd. I also installed rsync-daemon but I do not actually know whether that is needed. Here is the entire solution (I only did this on the remote computer--I believe the local computer, on which I then could run the command above successfully, only had openssh and rsync packages):
sudo dnf -y install rsync-daemon openssh
sudo systemctl enable rsyncd
sudo systemctl start rsyncd
sudo systemctl enable sshd
sudo systemctl start sshd
To be clear, I have Fedora 27, sudo systemctl status firewalld says firewall is running, and I did not have to manually create firewall rules of which I'm aware (there are no instances of firewall or iptables in my bash history). In the command (at the top of this answer) that successfully runs, I used some options but they are not required: r: recursive, t: copy timestamp to destination file,P: show progress. A forward slash (/) is at the end of only the source path, so that rsync doesn't create a directory called /home/someoneelse/source/source in the destination.