Ubuntu16.04下Redis3.0.6无法启动：无法打开AOF文件（只读文件系统）

Let's break down this error—it means either Redis doesn't have write permissions to the directory where your redis-test.aof file lives, or the underlying file system is mounted as read-only. Here's how to fix it step by step:

1. Locate Redis's working directory #

First, find where Redis is trying to create/write the AOF file. Check your Redis config file (usually /etc/redis/redis.conf) for the dir directive—this is the directory Redis uses for all data files.

If you want to quickly find it, use grep:

grep "^dir" /etc/redis/redis.conf

On Ubuntu 16.04, this will typically output dir /var/lib/redis (the default data directory).

2. Fix directory and file permissions #

Redis runs as the redis user by default on Ubuntu. Make sure the data directory and any existing redis-test.aof file are owned by this user:

• First, check current ownership:

  ls -ld /var/lib/redis  # Replace with your actual dir path from step 1
  ls -l /var/lib/redis/redis-test.aof  # Run this only if the file already exists
  

• If the owner is not redis:redis, fix it with:

  sudo chown -R redis:redis /var/lib/redis
  

• Ensure the directory has proper read/write permissions for the Redis user:

  sudo chmod 750 /var/lib/redis
  

3. Check if the file system is read-only #

If permissions look correct, verify that the partition hosting Redis's data directory isn't mounted as read-only. Run this command to view mount details:

mount | grep -v tmpfs

Look for the partition corresponding to your Redis directory (e.g., / if /var/lib/redis is on the root partition). If you see ro in the mount options, remount it as read-write:

sudo mount -o remount,rw /  # Replace with your partition path if different

4. Verify Redis service configuration #

If you're starting Redis via systemd (the default on Ubuntu 16.04), make sure the service runs Redis as the correct user. Open the service file:

sudo nano /lib/systemd/system/redis-server.service

Confirm there's a line that reads User=redis. If you made changes, reload systemd and restart Redis:

sudo systemctl daemon-reload
sudo systemctl restart redis-server

If Redis still fails to start after these steps, check the Redis logs (usually /var/log/redis/redis-server.log) for more specific details—sometimes hidden issues like low disk space can trigger this error too.

内容的提问来源于stack exchange，提问作者Дмитрий Смирнов