Linux'

Optimize Speed

라즈베리파이에서 우분투를 설치해서 사용하고 있는데, 인터넷 속도가 어마하게 느린 이슈가 있다. 거기서 개선을 위해 시도해본 것들에 대해 기록할 예정. ##1. iwconfig 일단 다음은 확실히 효용이 있는 것으로 보임. 60mb -> 140mb 정도로 개선됨. sudo iwconfig wlan0 power off ##2. zram 그리고나서, zswap 대신 zram 을 사용하도록 변경. sudo apt install -y linux-modules-extra-raspi sudo apt install -y zram-tools sudo apt autoremove --purge -y zram-config sudo nvim /etc/default/zramswap 에디터는 어떤걸 사용해도 상관없지만, nvim 사용하고 있어서 그걸로 세팅....

the Boot Procss and Hardware Resources

Requiring Boot Loader Passwords You can secure the boot process with a secure epassword to prevent someone from bypassing the user authentication step. This can work in conjunction with password protection for the BIOS. Note that while using a bootloader passwrd laone will stop a user from editing the bootloader configuration during the boot process, it will not prevent a user from booting from and alterantive boot media such as optical disks or pen drives....

4.working With Passwords

How Passwords Are Stored The system verifies authenticity and identity using user credentials. Originally, encrypted passwords wer stored in the /etc/passwd file, which was readable by everyone. this mde it rather easy for passwords to be craked. On modern systems. passwords are actually stored in an encrypted format in a secondary file named etc/shadow Onyly those with root access can read or modify this file. Password Encrpytion Protecting passwords has became a curucial element of security....

3.sudo Process Isolation Limiting Hardware Access and Keeping Systems Current

The sudoers File /etc/sudoers contains a lot of documentation in it about how to customize. Most Linux distributions now prefer you add a file in the directory etc/sudoers.d with a name the same as user. this file contains the individual user’s sudo configuration, and one should leave the main configuration file untouched except for changeds that affect that affect all users. sudo commands and any failures are logged in …...