shell linux dhcp TFTP PXE cobbler DNS bind OpenVPN MYSQL rsyslog journalctl logrotate FTP NFS SAMBA sersync LVS Tomcat Memcached nginx HAproxy keepalived KVM Docker Jumpserver Redis Zabbix kubeadm Kubernetes gitlab jenkins sonarqube RabbitMQ ZooKeeper kafka Dubbo elasticsearch logstash kibana filebeat sed awk yum apt ssh RAID TCP sudo chrony iptables NAT kubeasz Ceph Prometheus ansible 工具 minio harbor