Linux Under the Hood Feb23

[root@localhost system]# history
    1  dnf update -y
    2  cat /etc/os-release
    3  ls /proc
    4  history
    5  mount
    6  history
    7  mount | grep proc
    8  mount | grep sys
    9  cd /proc
   10  ls
   11  ps aux | grep 666
   12  cat cpuinfo
   13  ls
   14  less meminfo
   15  cd sys
   16  ls
   17  cd vm
   18  ls
   19  cat dirty_expire_centisecs
   20  echo 6000 > dirty_expire_centisecs
   21  cat dirty_expire_centisecs
   22  pwd
   23  sysctl -a
   24  sysctl -a | wc
   25  sysctl -a | grep centi
   26  pwd
   27  history
   28  vim /etc/sysctl.conf
   29  vim /etc/sysctl.d/50-dirty.conf
   30  cd /usr/lib/sysctl.d/
   31  ls
   32  pwd
   33  cd /sys
   34  ls
   35  cd bus
   36  ls
   37  cd cpu/devices/cpu1
   38  ls
   39  cat online
   40  lscpu | less
   41  echo 0 > online
   42  lscpu | less
   43  echo 1 > online
   44  cd /proc
   45  history
   46  ls
   47  less cpuinfo
   48  less meminfo
   49  ls
   50  echo h > sysrq-trigger
   51  dmesg
   52  #echo c > /proc/sysrq-trigger
   53  history -w
   54  pwd
   55  ls
   56  cd /root
   57  ls
   58  touch hello
   59  ls -l
   60  exit
   61  history
   62  cd /proc/sys/kernel/
   63  ls
   64  cat sysrq
   65  man proc
   66  cd
   67  dnf install -y git
   68  git clone https://github.com/sandervanvugt/luth
   69  history
   70  dnf install kernel-docs
   71  dnf install kernel-doc
   72  podman search ubuntu
   73  podman run -it ubuntu
   74  history
   75  uname -r
   76  #Ctrl-p, Ctrl-q
   77  podman ps
   78  history
   79  cd /proc
   80  ls
   81  cd 606
   82  cd 6060
   83  ls
   84  cat status
   85  ls
   86  cat cmdline
   87  podman run -d nginx
   88  podman ps
   89  podman exec -it kind_galois /bin/bash
   90  ls
   91  cd ns
   92  ls
   93  ls -l
   94  lsns
   95  man lsns
   96  lsns | wc
   97  lsns
   98  ps faux | less
   99  history
  100  man unshare
  101  echo test > /tmp/test
  102  chmod 600 /tmp/test
  103  ls -l /tmp/test
  104  podman run -it -v /tmp/test:/tmp/test:Z --uidmap 0:100000:5000 docker.io/library/fedora sh
  105  podman top --latest user huser
  106  ps aux
  107  cd
  108  luth/countdown 13
  109  podman run -it --name boos --privileged -v /:/host:Z ubi8 chroot /host
  110  podman run -it --name boos --privileged -v /:/host ubi8 chroot /host
  111  podman run -it --name boos2 --privileged -v /:/host ubi8 chroot /host
  112  exit
  113  cd luth/
  114  ls
  115  ./countdown 13
  116  dnf install zsh
  117  unshare --fork --pid --mount-proc zsh
  118  exit
  119  history
  120  ssh [email protected]
  121  ps faux | less
  122  cd luth/
  123  ls
  124  cd ..
  125  git clone https://github.com/sandervanvugt/performance
  126  cd performance/
  127  ls
  128  systemctl cat stress1.service
  129  systemctl cat stress2.service
  130  systemctl start stress1
  131  systemctl start stress2
  132  top
  133  echo 0 > /sys/bus/cpu/devices/cpu1/online
  134  toop
  135  top
  136  systemctl set-property system.slice CPUShares=1024
  137  top
  138  systemctl set-property sshd.service MemoryLimit=4M
  139  systemctl status sshd.service
  140  systemctl set-property sshd.service MemoryLimit=2M
  141  systemctl status sshd.service
  142  systemctl set-property sshd.service MemoryLimit=1M
  143  systemctl status sshd.service
  144  systemctl restart sshd.service
  145  systemctl status sshd.service
  146  cd
  147  cd /etc/systemd/system
  148  ls
  149  history
  150  podman generate -h | less
  151  podman ps
  152  podman generate systemd -h
  153  podman ps
  154  podman generate systemd --new --files --name kind_galois
  155  vim container-kind_galois.service
  156  podman stop kind_galois
  157  systemctl start container-kind_galois.service
  158  history
  159  systemctl status container-kind_galois.service
  160  journalctl
  161  top
  162  echo 1 > /sys/bus/cpu/devices/cpu1/online
  163  history
  164  ps faux | less
  165  systemctl status container-kind_galois.service
  166  sysctl -a
  167  sysctl -a | grep oom
  168  systemctl stop container-kind_galois.service
  169  echo 1 > /proc/sys/vm/oom_kill_allocating_task
  170  systemctl start container-kind_galois.service
  171  vim /etc/sysctl.d/99-i-hate-my-uncle.conf
  172  systemctl show sshd.service
  173  systemd-cgls
  174  systemctl set-property machine.slice CPUShares=2048
  175  systemctl set-property system.slice MemoryLimit=1024M
  176  systemctl set-property user.slice MemoryLimit=1024M
  177  pwd
  178  ls
  179  vim /etc/systemd/system.con
  180  vim /etc/systemd/system.control
  181  history