Programs that use io_uring do not work with Docker on CentOS 8

There is an asynchronous IO kernel function called io_uring introduced from Linux kernel 5.1, but the Docker image that uses it does not work on CentOS 8. Well, for those who know it, that's right.

As a rationale if you want to argue that the portability of Docker/Linux containers isn't all-purpose.

io_uring Create a program to use on Ubuntu 20.10.

    1. Create a virtual machine with an OS of Ubuntu 20.10.
    1. Install Docker.
    1. Launch the Ubuntu 20.10 image on Docker.

20.10 bash

 4. For the time being, check the kernel in use with uname -a.
```(c)# uname -a```

(Execution result) [email protected]:/liburing/examples# uname -a Linux 17003dd74a2f 5.8.0-33-generic #36-Ubuntu SMP Wed Dec 9 09:14:40 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

 5. Install gcc and io_uring libraries, git.
```(c)# apt-get update```
```(c)# apt-get install -y build-essential liburing-dev git```

 6. Get the sample program of io_uring.

#### **`(c)# git clone`**
  1. Compile the sample program. (c)# cd liburing/examples

(c)# gcc -Wall -O2 -D_GNU_SOURCE -o io_uring-test io_uring-test.c -luring

 8. Run the program. Of course, this works.

#### **`(c)# ./io_uring-test io_uring-test.c`**
(Execution result)
[email protected]:/liburing/examples# ./io_uring-test io_uring-test.c
Submitted=1, completed=1, bytes=2256
  1. Detach (C-p, C-q) from the container, commit, and save the image. # docker commit io_uring-test io_uring-test

# docker save io_uring-test -o io_uring-test.tar

# Run the program on CentOS 8 Docker

 1. 1. Create a virtual machine whose OS is CentOS 8.3.

 2. 2. Install Docker.

 3. 3. Copy the previous Docker image (io_uring-test.tar) to your CentOS 8 machine and load it.

#### **`# docker load -i io_uring-test.tar`**

 4. Start the container.
```# docker run -it --rm io_uring-test bash```

 5. For the time being, check the kernel in use with uname -a. It should be 4.18, the same as the host CentOS 8.
```(c)# uname -a```

(Execution result) [email protected]:/# uname -a Linux 824c737193b6 4.18.0-240.1.1.el8_3.x86_64 #1 SMP Thu Nov 19 17:20:08 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

(By the way) [email protected]:/liburing/examples# cat /etc/os-release NAME="Ubuntu" VERSION="20.10 (Groovy Gorilla)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 20.10" VERSION_ID="20.10" HOME_URL="" SUPPORT_URL="" BUG_REPORT_URL="" PRIVACY_POLICY_URL="" VERSION_CODENAME=groovy UBUNTU_CODENAME=groovy

 5. Run the sample program.
```(c)# cd liburing/examples/```

#### **`(c)# ./io_uring-test io_uring-test.c`**
(Execution result)
[email protected]:/liburing/examples# ./io_uring-test io_uring-test.c
queue_init: Function not implemented

Well, it doesn't work.

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