Method 1: using text editor
# Edit the syslog config
sudo vi /etc/rsyslog.d/vyatta-log.conf
# Change the @ = udp symbol to @@ = tcp
# add :PORTNUMBER after node name or IP if necessary
admin@EdgeRouter-4:~$ cat /etc/rsyslog.d/vyatta-log.conf
*.err @graylog.kimconnect.com
*.notice;local7.debug -/var/log/messages
Method 2: use sed to update texts
# Change from udp to tcp
sudo sed 's/@/@@/' -i /etc/rsyslog.d/vyatta-log.conf
cat /etc/rsyslog.d/vyatta-log.conf
# Change from tcp to udp
sudo sed 's/@@/@/' -i /etc/rsyslog.d/vyatta-log.conf
cat /etc/rsyslog.d/vyatta-log.conf
# Restart syslogd
sudo service rsyslog restart
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