using zfs send/receive, by leveraging snapshot pruning

transfer only some directories of a zpool/dataset

1. Create initial snapshot

1

zfs snapshot pool/dataset@001

2. Remove unwanted directories (not to be transferred)

1

rm -rf /pool/dataset/unwanted_dir1 /pool/dataset/unwanted_dir2

3. Create second snapshot (only includes wanted directories)

1

zfs snapshot pool/dataset@002

4. Send only the second snapshot, with compression (-c for compressed stream)

1

zfs send -c pool/dataset@002 | zfs receive -F pool2/dataset

5. Destroy snapshot @002 (cleanup)

1

zfs destroy pool/dataset@002

6. Rollback to the original full snapshot

1

zfs rollback -r pool/dataset@001

7. Destroy snapshot @001 (final cleanup)

1

zfs destroy pool/dataset@001

Finding a Login Protection Solution

For any website, robust login protection is crucial. Existing solutions often fall short of my requirements:

1. Security
2. Dynamic capability
3. Resistance to brute force attacks

I analyzed many options and initially considered Aerospike and ScyllaDB as ideal solutions. However, I abandoned these ideas because they proved too difficult to compile from source on standard Linux systems. I attempted builds on both Debian and Alpine with no success.

Because of we need to sync the timer of linux server.. The system provided service is too active to try to connect unknow server, so, write a C prog to do it..

1
2
3
4
5
6

void print_usage(const char *program_name) {
    printf("Usage: %s [OPTIONS]\n", program_name);
    printf("Options:\n");
    printf("  -d, --debug    Enable debug output\n");
    printf("  -h, --help     Display this help message\n");
}

You can use ‘-h/–help’ to print the help info.