LFCS day2 feb22

#### automating mount of loop devices with systemd dependencies
[root@localhost system]# cat loop.service
[Unit]
Description=automatically set up loop devices
Documentation=man:losetup

[Service]
Type=oneshot
ExecStart=/usr/sbin/losetup -fP /diskfile.img
PrivateDevices=no

[Install]
WantedBy=local-fs.target
[root@localhost system]# tail -1 /etc/fstab
/dev/loop0p1		/loop0			ext2	x-systemd.requires=loop.service		0 0

######
[root@localhost ~]# history
    1  find / -name "hosts"
    2  find / -name "*hosts*"
    3  locate hosts
    4  history
    5  updatedb
    6  locate hosts
    7  touch sander
    8  locate sander
    9  find / -name "sander"
   10  find / -user student
   11  find / -user student | wc
   12  w
   13  useradd linda
   14  find / -user linda
   15  find / -user linda -exec cp {} /root/linda/ \;
   16  mkdir /root/linda ; find / -user linda -exec cp {} /root/linda/ \;
   17  ls -a linda
   18  ls -l
   19  cd linda
   20  ls -l
   21  -a
   22  ls -a
   23  find / -perm /4000
   24  man find
   25  find / -type f -size +100M
   26  mkdir -p find/content; find /etc -exec grep -l student {} \; -exec cp {} find/content/ \; 2>/dev/null
   27  ls
   28  tree find/
   29  find /etc/ -name '*' -type f | xargs grep '127.0.0.1'
   30  vim /etc/dummy
   31  find /etc/ -name '*' -type f | xargs grep '127.0.0.1'
   32  find /etc/ -name '*' -type f | xargs grep '127\.0\.0\.1'
   33  cd
   34  vim countdown
   35  history
   36  bash countdown 13
   37  sed -n 5p /etc/passwd
   38  vim myfile
   39  sed -i 's/old/new/' myfile
   40  cat myfile
   41  sed -i 's/old/new/g' myfile
   42  cat myfile
   43  sed -i -e '2d' myfile
   44  cat myfile
   45  awk -F : '{ print $4 }' /etc/passwd
   46  awk -F : '/linda/ { print $3 }' /etc/passwd
   47  man awk
   48  pinfo awk
   49  last
   50  which last
   51  ls -l /bin/last
   52  vim /etc/login.defs
   53  cd /etc/skel/
   54  ls -al
   55  echo hello > hello
   56  pwd
   57  useradd -m -s /bin/bash bob
   58  cd /home/bob
   59  ls -al
   60  ls -ld .
   61  passwd -S bob
   62  chage -l bob
   63  id bob
   64  tail /etc/passwd
   65  man 5 passwd
   66  finger bob
   67  usermod -s /usr/bin/passwd bob
   68  tail -1 /etc/passwd
   69  passwd bob
   70  su - bob
   71  password
   72  finger
   73  yum provides */finger
   74  yum install -y epel-release
   75  ssh [email protected]
   76  cd
   77  countdown 12
   78  ./countdown 12
   79  bash countdown 12
   80  useradd -G wheel -s /usr/bin/passwd anna
   81  chage anna
   82  grep anna /etc/passwd /etc/shadow /etc/group
   83  passwd --help
   84  usermod -s /bin/bash anna
   85  passwd anna
   86  passwd -e anna
   87  su - anna
   88  su - student
   89  ssh [email protected]
   90  #make sure the following is entered after doing visudo: Defaults timestamp_type=global,timestamp_timeout=240
   91  history
   92  history -d 90
   93  history
   94  touch myfile
   95  ls -l myfile
   96  chattr +i myfile
   97  rm -f myfile
   98  lsattr myfile
   99  chattr -i myfile
  100  lsattr myfile
  101  rm myfile
  102  ls
  103  countdown
  104  echo $PATH
  105  ./countdown
  106  ls -l
  107  chmod +x countdown
  108  ./countdown
  109  cd /home/linda
  110  touch wortel
  111  su - linda
  112  cd
  113  groupadd sales
  114  groupadd account
  115  usermod -aG sales linda
  116  usermod -aG sales lisa
  117  useradd -G sales lisa
  118  usermod -aG account anna
  119  useradd -G account anouk
  120  grep -E {account|sales} /etc/group
  121  grep -E '{account|sales}' /etc/group
  122  tail -2 /etc/group
  123  tail -10 /etc/group
  124  mkdir -p /data/account /data/sales
  125  cd /data
  126  ls -l
  127  chmod 770 *
  128  ls -l
  129  chgrp account account
  130  chgrp sales sales
  131  ls -l
  132  id anna
  133  usermod -G sales anna
  134  id anna
  135  usermod -aG account,wheel anna
  136  id anna
  137  usermod -G account,wheel anna
  138  su - anna
  139  su - anouk
  140  chmod +t *
  141  chmod g+s *
  142  ls -l
  143  su - anna
  144  su - anoukt
  145  su - anouk
  146  history
  147  cd
  148  ./countdown 21
  149  ls -l /data
  150  man chattr
  151  umask
  152  cd /etc
  153  grep -R 'umask' *
  154  vim bashrc
  155  cd skel/
  156  ls -a
  157  vim .bashrc
  158  awk -F : ' $3 > 1000 { print $1 }'
  159  awk -F : ' $3 > 1000 { print $1 }' /etc/passwd
  160  which passwd
  161  ls -l $(which passwd)
  162  for i in $(awk -F : ' $3 > 1000 { print $1 }' /etc/passwd); echo $i; done
  163  for i in $(awk -F : ' $3 > 1000 { print $1 }' /etc/passwd); do echo $i; done
  164  for i in $(awk -F : ' $3 > 1000 { print $1 }' /etc/passwd); do cp .bashrc /home/$i/; done
  165  for i in $(awk -F : ' $3 > 1000 { print $1 }' /etc/passwd); do cp -f .bashrc /home/$i/; done
  166  su - anna
  167  su - anouk
  168  cd
  169  cd /data
  170  ls -l
  171  su - linda
  172  history
  173  ls -l `which ls`
  174  ls -l `which passwd`
  175  ls -l $(which passwd)
  176  df -h
  177  poweroff
  178  setenforce 0
  179  su - linda
  180  setenforce
  181  setenforce 1
  182  su - linda
  183  exit
  184  cat /etc/passwd
  185  su - anouk
  186  lsblk
  187  df -h
  188  dd if=/dev/zero of=/diskfile.img bs=1M count=1024
  189  dd if=/dev/zero of=/diskfile2.img bs=1M count=1024
  190  losetup -fP /diskfile.img
  191  losetup -fP /diskfile2.img
  192  losetup -a
  193  lsblk
  194  ./countdown 12
  195  history
  196  lsblk
  197  fdisk /dev/loop0
  198  mkfs.ext2 /dev/loop0p1
  199  lsblk
  200  mount /dev/loop0p1 /mnt
  201  cd /mnt
  202  touch loop1file
  203  ls -kl
  204  cd
  205  umount /mnt
  206  ls /mnt
  207  vim /etc/fstab
  208  mount -a
  209  mkdir /loop0
  210  mount -a
  211  mount
  212  ls /loop0
  213  reboot
  214  losetup -a
  215  losetup -fP diskfile.img
  216  losetup -fP /diskfile.img
  217  lsblk
  218  mount -a
  219  mount
  220  tail -1 /etc/fstab
  221  su - anouk
  222  su - anna
  223  su - anouk
  224  su - anna
  225  history
  226  df -h
  227  history
  228  vim /etc/fstab
  229  reboot
  230  mount -a
  231  losetup -fP /diskfile.img
  232  systemctl list-dependencies
  233  cd /usr/lib/systemd/system
  234  cp fstrim.service /etc/systemd/system/loop.service
  235  vim /etc/systemd/system/loop.service
  236  systemctl cat sshd.service
  237  vim /etc/systemd/system/loop.service
  238  systemctl enable loop.service
  239  reboot
  240  history
  241  systemctl status loop.service
  242  vim /etc/fstab
  243  reboot
  244  ssh [email protected]
  245  cd /etc/systemd/system/
  246  ls
  247  vim loop.service
  248  systemctl enable --now loop.service
  249  cat loop.service
  250  tail -1 /etc/fstab
  251  mount | grep loop
  252  lsblk
  253  fdisk /dev/sdb
  254  xxd /dev/sdb1 | less
  255  pvcreate /dev/sdb1
  256  xxd /dev/sdb1 | less
  257  pvs
  258  vgcreate --help | less
  259  vgcreate vgdata /dev/sdb1
  260  pvs
  261  vgs
  262  lvcreate --help | less
  263  lvcreate --longhelp | wc
  264  lvcreate --longhelp | less
  265  lvcreate -n lvdata -L 1G vgdata
  266  lvs
  267  mkfs.xfs /dev/vgdata/lvdata
  268  mkdir /lvdata
  269  vim /etc/fstab
  270  mount -a
  271  history
  272  grep student /etc/*
  273  ps aux
  274  ps aux | grep cron
  275  lvs
  276  df -h
  277  tail -1 /etc/fstab
  278  ls -l /dev/mapper/vgdata-lvdata /dev/vgdata/lvdata
  279  vgs
  280  vgextend --help
  281  pvs
  282  vgextend vgdata /dev/sdb2
  283  vgs
  284  lvs
  285  lvextend /dev/vgdata/lvdata -L +1G
  286  lvs
  287  df -h
  288  xfs_growfs /dev/vgdata/lvdata
  289  df -h
  290  fdisk /dev/sdc
  291  mkfs.ext4 /dev/sdc1
  292  mkdir /sdc1
  293  vim /etc/fstab
  294  mount -a
  295  df -h
  296  poweroff
  297  mount
  298  cd /sdc1
  299  touch testfiles{1..100}
  300  ls
  301  df -h | grep sdc
  302  cd
  303  fdisk /dev/sdc
  304  umount /dev/sdc1
  305  fdisk /dev/sdc
  306  mount -a
  307  df -h
  308  resize2fs /dev/sdc1
  309  df -h
  310  cd /dev/sdc1
  311  cd /sdc1
  312  ls
  313  history
  314  vim /etc/fstab
  315  man -k label
  316  man -k user
  317  mandb
  318  man -k label
  319  e2label --help
  320  man e2label
  321  e2label /dev/sdc1 coffee
  322  blkid
  323  vim /etc/fstab
  324  umount /dev/sdc1
  325  cd /
  326  umount /dev/sdc1
  327  mount -a
  328  xfs_admin --help
  329  cd
  330  ./countdown 12
  331  vim /etc/fstab
  332  lsblk
  333  vim /etc/fstab
  334  umount /dev/sdc1
  335  dd if=/dev/zero of=/dev/sdc bs=1M count=1024
  336  reboot
  337  lsblk
  338  mdadm --create /dev/md0 --level 5 --raid-devices 3 /dev/sd{c,d,e}
  339  cat /proc/mdstat
  340  mdadm --details /dev/md0
  341  mdadm --detail /dev/md0
  342  mdadm --detail --scan --verbose
  343  mdadm --detail --scan --verbose >> /etc/mdadm.conf
  344  cat /proc/mdstat
  345  mkfs.ext4 -L DATA /dev/md0
  346  iostat
  347  iostat 2 50
  348  vim /etc/fstab
  349  man mdadm
  350  vim /etc/default/grub
  351  #grub2-mkconfig -o /boot/grub/grub.cfg
  352  find / -name "grub.cfg"
  353  grub2-mkconfig -o /boot/grub2/grub.cfg
  354  history
  355  reboot
  356  systemctl --type help
  357  systemctl list-units
  358  systemctl cat sshd.service
  359  ps aux | grep ssh
  360  kill -9 1125
  361  systemctl status sshd
  362  systemctl cat sshd.service
  363  yum install httpd
  364  systemctl status httpd
  365  systemctl enable --now httpd
  366  systemctl cat httpd.service
  367  ls /etc/systemd/system/multi-user.target.wants/
  368  ls /etc/systemd/system/multi-user.target.wants/ -l
  369  systemctl disable httpd.service
  370  systemctl status httpd.service
  371  systemctl stop httpd
  372  yum install vsftpd
  373  systemctl edit httpd.service
  374  systemctl status httpd
  375  ps aux | grep httpd
  376  ps aux | grep http
  377  ps aux | grep ftp
  378  systemctl start httpd
  379  ps aux | grep ftp
  380  systemctl status httpd
  381  ./countdown 12
  382  export EDITOR=/usr/bin/vim
  383  systemctl edit httpd.service
  384  systemctl show httpd.service
  385  systemctl list-dependencies
  386  cd /usr/lib/systemd/system
  387  ls
  388  ls fstrim*
  389  systemctl cat fstrim.service
  390  systemctl cat fstrim.timer
  391  systemctl list-timers
  392  man 7 systemd.time
  393  man 7 systemd.timer
  394  man -k systemd
  395  man systemd.generator
  396  man systemd.directives
  397  man systemd.unit
  398  cd /run/systemd/generator/
  399  ls
  400  cat /etc/fstab
  401  vim lvdata.mount
  402  vim loop0.mount
  403  cp loop0.mount /etc/systemd/system/
  404  systemctl list-dependencies
  405  cd /etc/systemd/system/
  406  vim loop0.mount
  407  vim /etc/fstab
  408  systemctl enable loop0.mount --now
  409  reboot
  410  systemctl disable loop0.service
  411  systemctl disable loop0.mount
  412  vim /etc/fstab
  413  history
  414  grep -E '{svm|vmx}' /proc/cpuinfo
  415  grep vmx /proc/cpuinfo
  416  ./countdown 22
  417  mkdir /nfsshare
  418  vim /etc/exports
  419  systemctl enable --now nfs-server
  420  yum search nfs
  421  yum install nfs-utils
  422  systemctl enable --now nfs-server
  423  showmount -e localhost
  424  ip a
  425  firewall-cmd --list-all
  426  systemctl stop firewalld
  427  systemctl start firewalld
  428  firewall-cmd --get-services
  429  firewall-cmd --add-service mountd
  430  firewall-cmd --add-service mountd --permanent
  431  firewall-cmd --add-service nfs --permanent
  432  firewall-cmd --add-service nfs3 --permanent
  433  firewall-cmd --add-service rpc-bind --permanent
  434  systemctl restart firewalld
  435  vim /etc/httpd/conf/httpd.conf
  436  cd /var/www/html/
  437  vim index.html
  438  systemctl enable --now httpd
  439  curl localhost
  440  df -h
  441  poweroff
  442  vgs
  443  lsblk
  444  dd if=/dev/zero of=/dev/sdc bs=1M count=10
  445  dd if=/dev/zero of=/dev/sdd bs=1M count=10
  446  fdisk /dev/sdc
  447  vgextend cs /dev/sdc1
  448  vgs
  449  lvextend /dev/cs/root -l +100%FREE
  450  lvextend /dev/cs/root -l +100%FREE -r
  451  df -h
  452  dd if=/dev/sr0 of=/centos.iso bs=1M
  453  yum groups list
  454  yum groups install "Virtualization Host"
  455  yum install virt-manager
  456  systemctl enable --now libvirtd
  457  lsmod | grep kvm
  458  virt-manager &
  459  virsh list
  460  ./countdown 12
  461  alias docker=podman
  462  yum module install container-tools
  463  yum search podman
  464  yum install podman
  465  vim /etc/containers/registries.conf
  466  podman run -d nginx
  467  podman ps
  468  podman run ubuntu
  469  docker ps
  470  podman ps -a
  471  podman run -it ubuntu
  472  docker ps
  473  uname -r
  474  docker exec -it upbeat_babbage /bin/bash
  475  ps fax
  476  podman ps
  477  podman inspect upbeat_babbage | less
  478  ip a | less
  479  podman run -p 8080:80 -d nginx
  480  podman ps
  481  curl localhost:8080
  482  history
[root@localhost ~]#