Harbor Active-Standby Deployment: From Installation to HTTPS and Replication

Tue, 04 Aug 2026 00:00:00 +0000

Complete guide to deploying Harbor enterprise Docker registry with active-standby architecture, HTTP/HTTPS modes, self-signed certificates, and cross-host replication.

Docker Image Too Large? 10 Tips to Shrink It by 90%

Thu, 30 Jul 2026 12:00:00 +0800

10 proven techniques to reduce Docker image size by over 90%.

How to Make Dockerfile Builds Faster: 10 Practical Optimization Tips

Thu, 30 Jul 2026 11:00:00 +0800

10 proven tips — from cache strategy to multi-stage builds — to dramatically cut Docker build time.

COPY vs ADD in Dockerfile: A Detailed Comparison

Thu, 30 Jul 2026 10:00:00 +0800

COPY and ADD can both copy files, but their behaviors differ greatly. This article explains the difference through side-by-side comparisons and examples.

flannel in Action: Building Docker Cross-Host Container Networks from Scratch

Wed, 21 May 2025 00:00:00 +0000

flannel in Action: Building Docker Cross-Host Container Networks from Scratch

I. Network Environment Planning

etcd host IP: 192.168.8.88 hostname: docker-network
Host1 IP: 192.168.8.188 hostname: web01
Host2 IP: 192.168.8.99 hostname: web02

II. etcd Host Configuration

Step 1: Download and Extract etcd

Download etcd-v3.6.0-linux-amd64.tar.gz package from github.com
Copy the package to the etcd host /root directory and extract:

`1`	`[root@docker-network ~]# tar -zxvf etcd-v3.6.0-linux-amd64.tar.gz`

Step 2: Install etcd Executable Files

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[root@docker-network ~]# cd etcd-v3.6.0-linux-amd64
[root@docker-network etcd-v3.6.0-linux-amd64]# cp etcd* /usr/local/bin/

Step 3: Create Data Directory

`1`	`[root@docker-network ~]# mkdir /var/lib/etcd`

Step 4: Configure and Start etcd Service

Create etcd.service file:

`1`	`[root@docker-network ~]# vim /usr/lib/systemd/system/etcd.service`

[Unit]
Description=etcd_service
[Service]
ExecStart=/usr/local/bin/etcd --name etcd1 --data-dir /var/lib/etcd --listen-client-urls http://192.168.8.88:2379,http://127.0.0.1:2379 --advertise-client-urls http://192.168.8.88:2379,http://127.0.0.1:2379
[Install]
WantedBy=multi-user.target

Reload system service configuration and start etcd:

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[root@docker-network ~]# systemctl daemon-reload
[root@docker-network ~]# systemctl enable etcd.service
[root@docker-network ~]# systemctl restart etcd.service

Verify etcd listening status:

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[root@docker-network ~]# netstat -tulnp |grep :2379
tcp        0      0 192.168.8.88:2379       0.0.0.0:*               LISTEN      1912/etcd
tcp        0      0 127.0.0.1:2379          0.0.0.0:*               LISTEN      1912/etcd

Step 5: Add flannel Network Configuration to etcd

etcdctl --endpoints http://127.0.0.1:2379 put /coreos.com/network/config '{"Network": "172.16.0.0/16", "SubnetLen": 24, "SubnetMin": "172.16.1.0","SubnetMax": "172.16.10.0", "Backend": {"Type": "vxlan"}}'

The above content is all on one line. Verify that the configuration was written successfully

Docker on DAWN's Blog

Harbor Active-Standby Deployment: From Installation to HTTPS and Replication

Docker Image Too Large? 10 Tips to Shrink It by 90%

How to Make Dockerfile Builds Faster: 10 Practical Optimization Tips

COPY vs ADD in Dockerfile: A Detailed Comparison

flannel in Action: Building Docker Cross-Host Container Networks from Scratch

flannel in Action: Building Docker Cross-Host Container Networks from Scratch

I. Network Environment Planning

II. etcd Host Configuration

Step 1: Download and Extract etcd

Step 2: Install etcd Executable Files

Step 3: Create Data Directory

Step 4: Configure and Start etcd Service

Step 5: Add flannel Network Configuration to etcd