Ubuntu开启/var/log/messages

# 添加配置到/etc/rsyslog.d/50-default.conf
cat <<'EOF' | sudo tee -a /etc/rsyslog.d/50-default.conf
*.info;mail.none;authpriv.none;cron.none /var/log/messages 
EOF

# 重启rsyslog服务
sudo systemctl restart rsyslog.service