If a getrandom error occurs during installation

Some versions of the operating system (OS) kernel do not have the ability to execute a getrandom system call. This leads to an error when installing the platform.

To install the platform on such a server, update the OS kernel and, if necessary, install the rng-tools utility set.

Diagnostics

Connect to the server via SSH and run the command:

docker logs dci_auth_back4_1

If the installation error is due to the getrandom system call, the response will contain a line he following form:

libc++abi: terminating with uncaught exception of type boost::wrapexcept<boost::uuids::entropy_error>: getrandom

Solution

Connect to the server via SSH.
Update the OS kernel to at least kernel-3.10.0-544.el7.

Check the entropy level of the system:

cat /proc/sys/kernel/random/entropy_avail

If the entropy level is below 200:
1. Install rng-tools:
  AlmaLinux
```
yum install rng-tools
```
  Ubuntu
```
apt install rng-tools
```
2. If CentOS is installed on the server, change the line in the /systemd/system/multi-user.target.wants/rngd.service file as shown below:
```
ExecStart=/sbin/rngd -f
```
  replace by
```
ExecStart=/sbin/rngd -f -r /dev/urandom
```
3. Restart the service
  AlmaLinux
```
systemctl daemon-reload && systemctl start rngd
```
  Ubuntu
```
systemctl daemon-reload && systemctl start rng-tools
```
4. Сheck the entropy level of the system again:
```
cat /proc/sys/kernel/random/entropy_avail
```
  In case of successful installation, the level value must be above 200.