垃圾回收（Garbage Collection，简称 GC）是一种自动管理内存的机制，它可以在程序运行时自动回收不再需要的内存空间，以提高程序的性能和稳定性。



GO语言的垃圾回收机制主要是采用标记清除（mark-and-sweep）和三色标记（tricolor marking）算法，通过标记和清除对象来管理内存空间。
标记清除算法通过标记活动对象，清除不再使用的对象来回收内存。三色标记算法通过将对象分为三种不同的颜色（白、灰和黑）来识别需要回收的对象。GO语言的垃圾回收机制可以自动进行内存管理，提高程序性能和稳定性。

探究Go的GC

有时候Nginx反代不生效

关闭iptabls 或者 firewalld

#停止firewall
```

systemctl stop firewalld.service
```
#禁止firewall开机启动
```


systemctl disable firewalld.service
```
#关闭iptables
```

service iptables stop
```

#去掉iptables开机启动
```

chkconfig iptables off
```
或者直接开放所有端口
```
sudo iptables -P INPUT ACCEPT
sudo iptables -P FORWARD ACCEPT
sudo iptables -P OUTPUT ACCEPT
sudo iptables -F
```
或者强制关闭
```
sudo apt-get purge netfilter-persistent
sudo reboot
```

或者强制删除
```

sudo rm -rf /etc/iptables && sudo reboot
```

注意，如果服务器后台放行了新的端口，需要重新同步iptables。

Ubuntu防火墙开放所有端口

Ubuntu和Debian通过ppa安装最新版本的docker


Ubuntu
```
#!/bin/bash

# Check for software-properties-common package
if ! command -v add-apt-repository &> /dev/null; then
    echo "Package 'software-properties-common' not found. Installing..."
    sudo apt update
    sudo apt install -y software-properties-common
fi

# Check CPU architecture and set variables accordingly
if [[ $(arch) == "aarch64" ]]; then
  DOCKER_ARCH="arm64"
else
  DOCKER_ARCH="amd64"
fi

# Add Docker PPA
sudo add-apt-repository "deb [arch=${DOCKER_ARCH}] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

# Update package list
sudo apt update

# Install Docker
sudo apt install docker-ce docker-ce-cli containerd.io

# Add current user to the docker group so that sudo is not required for every Docker command
# sudo usermod -aG docker $USER

```
Debian
```
#!/bin/bash

# Install curl、gnupg和docker-compose
sudo apt-get -y update && sudo apt-get -y install curl gnupg lsb-release



ARCH=$(dpkg --print-architecture)
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg


echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null


sudo apt update
sudo apt install docker-ce docker-ce-cli containerd.io

```

Linux安装Docker

发现一个docker ui 项目
https://github.com/gohutool/docker.ui


利用dockerui管理，省去了每次进入控制台敲命令的步骤。
但似乎没有ARM,所以记一次自己编译。


```
sudo docker container run --rm --name docker.ui -v /var/run/docker.sock:/var/run/docker.sock -p 8009:8999 joinsunsoft/docker.ui
WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested
exec ./server: exec format error
```
拉取源码构建镜像

```
git clone https://github.com/gohutool/docker.ui.git && cd docker.ui
```

```
vim Dockerfile
```
把 “RUN mkdir /lib64 && ln -s /lib/libc.musl-x86_64.so.1 /lib64/ld-linux-x86-64.so.2” 
两个关键词“”x86_64“改成”aarch64“ 

```
RUN mkdir /lib64 && ln -s /lib/libc.musl-aarch64.so.1 /lib64/ld-linux-aarch64.so.2
```
当然，如果想兼容两个平台，把以下代码块替换掉“RUN mkdir /lib64 && ln -s /lib/libc.musl-x86_64.so.1 /lib64/ld-linux-x86-64.so.2” 

```
# Create symbolic link for ARM architecture
RUN if [ $(uname -m) = "aarch64" ]; then \
        mkdir -p /lib64 && \
        ln -s /lib/ld-musl-aarch64.so.1 /lib64/ld-linux-aarch64.so.1; \
    fi

# Create symbolic link for AMD64 architecture
RUN if [ $(uname -m) = "x86_64" ]; then \
        mkdir -p /lib64 && \
        ln -s /lib/ld-musl-x86_64.so.1 /lib64/ld-linux-x86-64.so.2; \
    fi
```
开始构建。ui是容器名 后方的docker.ui是tag
```
sudo docker build -t ui:docker.ui . 
```
后台运行,宿主8009端口映射到docker8999端口

```
sudo docker container run -d --rm --name docker.ui -v /var/run/docker.sock:/var/run/docker.sock -p 8009:8999 ui:docker.ui
```
默认Username/Password ginghan/123456

用Web来管理Dokcer——DockerUI

Docker构建一个带桌面的ARM架构的Ubuntu镜像

仅为笔记，出现了灰屏，原因未知
```
FROM arm64v8/ubuntu:latest

ENV DEBIAN_FRONTEND noninteractive

ENV VNC_ENCODING=raw
ENV VNC_QUALITY=6
ENV VNC_AUTOSELECT=0

# 安装基础组件和中文字体
RUN apt-get update && \
    apt-get install -y \
        locales \
        openssl \
        fonts-wqy-microhei \
        xfonts-wqy \
        x11-xserver-utils \
        xauth \
        sudo \
        tightvncserver \
        xfonts-base \
        xfonts-75dpi \
        xfonts-100dpi \
        xfonts-cyrillic \
        xfonts-scalable \
        && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

# 配置语言环境
RUN echo "zh_CN.UTF-8 UTF-8" > /etc/locale.gen && \
    locale-gen
    
RUN touch ~/.Xauthority && chmod 600 ~/.Xauthority
RUN touch /root/.Xresources
RUN echo "#!/bin/bash" > /root/.xsession && \
    echo "exec /etc/X11/Xsession" >> /root/.xsession && \
    chmod +x /root/.xsession

RUN mkdir -p /root/.vnc

RUN echo "Encoding=jpeg" >> /root/.vnc/config && \
    echo "Quality=9" >> /root/.vnc/config && \
    echo "AutoSelect=1" >> /root/.vnc/config


# 将用户设置为 root 并设置密码
RUN usermod --password $(echo "root" | openssl passwd -1 -stdin) root

# 启动 VNC 服务
CMD ["bash", "-c", "vncserver :1 -geometry 1280x800 -depth 24 && tail -F /root/.vnc/*.log"]
```
构建镜像
```
sudo docker build -t my-ubuntu-vnc .
```
运行docker
```
sudo docker run -it -p 8001:5901 -e VNC_ENCODING=jpeg -e VNC_QUALITY=9 -e VNC_AUTOSELECT=1 -e USER=root my-ubuntu-vnc
```