Hey there, let's tackle your issues one by one. First, the sudo apt-get update timeouts you're seeing are super common with EC2's default regional sources, especially if you're in a region where those archives have poor connectivity. Here's how to fix it:

1. Switch to Domestic Ubuntu Mirrors #

The default EC2 mirrors in ap-south-1 might be flaky for your network. Replacing them with faster domestic mirrors (like Alibaba Cloud or Tsinghua University's) will usually resolve the timeout problem:

• First, back up your original sources list to avoid messing things up:

  sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
  

• Then open the sources list file with a text editor (e.g., nano):

  sudo nano /etc/apt/sources.list
  

• Replace all existing content with the appropriate sources for your Ubuntu version. For example, if you're on Ubuntu 20.04 (focal), use this Alibaba Cloud source:

  deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
  deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
  deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
  deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
  deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
  deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
  deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
  deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
  deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
  deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
  

  (Adjust the version codename if you're on a different Ubuntu release—like jammy for 22.04)
• Save the file (Ctrl+O in nano, then Enter) and exit (Ctrl+X). Now run sudo apt-get update again—it should work without timeouts.

2. Verify EC2 Security Group Settings #

Since you're using an EC2 instance, make sure your security group allows outbound HTTP (port 80) and HTTPS (port 443) traffic. If outbound rules are restricted, your instance can't reach the update servers at all. Head to the AWS Console, check the security group attached to your instance, and ensure outbound traffic is allowed to 0.0.0.0/0 for those ports.

3. Test Network Connectivity #

If switching mirrors doesn't work, test if you can reach the mirror servers:

ping mirrors.aliyun.com

If you get no response, there might be a network issue with your EC2 instance (like a VPC route problem). In that case, check your VPC's internet gateway attachment and route tables to ensure traffic can exit to the internet.

Yes, you might run into similar network-related problems during Hadoop installation, but they're solvable with similar approaches:

• Installing Hadoop dependencies: If you need to install packages like ssh, rsync, or others via apt, fixing your sources list as above will prevent timeout issues here.
• Downloading Hadoop binaries: The official Apache Hadoop download links can be slow from some regions. Instead, use domestic mirrors to download the tarball faster. For example, you can use wget with a mirror URL:

  wget https://mirrors.tuna.tsinghua.edu.cn/apache/hadoop/common/hadoop-3.3.6/hadoop-3.3.6.tar.gz
  

• Hadoop cluster network setup: When configuring the Hadoop cluster, you'll need to ensure all nodes can communicate with each other (via SSH, and Hadoop's service ports). Make sure your EC2 security groups allow inbound traffic between cluster nodes for ports like 50070 (NameNode), 8088 (ResourceManager), etc.

Once you fix the apt source issue, you'll be able to install Java (I recommend openjdk-8-jdk since it's compatible with most Hadoop versions) smoothly with:

sudo apt-get install openjdk-8-jdk

内容的提问来源于stack exchange，提问作者luckyluke