Unix-Like

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August 27, 2023 1 min read Docs

Docs SysAdmin Systems Unix-Like Investigate

Compare staffs Compare two jar files: 1diff -W200 -y <(unzip -vqq file1.jar | awk '{ if ($1 > 0) {printf("%s\t%s\n", $1, $8)}}' | sort -k2) <(unzip -vqq file2.jar | awk '{ if ($1 > 0) {printf("%s\t%s\n", $1, $8)}}' | sort -k2)

August 27, 2023 2 min read Docs

🚩 Files

Docs SysAdmin Systems Unix-Like Investigate

Find a process blocking a file with fuser: 1fuser -m </dir or /files> # Find process blocking/using this directory or files. 2fuser -cu </dir or /files> # Same as above but add the user 3fuser -kcu </dir or /files> # Kill process 4fuser -v -k -HUP -i ./ # Send HUP signal to process 5 6# Output will send you <PID + letter>, here is the meaning: 7# c current directory. 8# e executable being run. 9# f open file. (omitted in default display mode). 10# F open file for writing. (omitted in default display mode). 11# r root directory. 12# m mmap'ed file or shared library. with lsof ( = list open file): 1lsof +D /var/log # Find all files blocked with the process and user. 2lsof -a +L1 <mountpoint> # Process blocking a FS. 3lsof -c ssh -c init # Find files open by thoses processes. 4lsof -p 1753 # Find files open by PID process. 5lsof -u root # Find files open by user. 6lsof -u ^user # Find files open by user except this one. 7kill -9 `lsof -t -u toto` # kill user's processes. (option -t output only PID). MacGyver method: 1#When you have no fuser or lsof: 2find /proc/*/fd -type f -links 0 -exec ls -lrt {} \;

August 27, 2023 1 min read Docs

🚩 Network Manager

Docs SysAdmin Systems Unix-Like Networks

Basic Troubleshooting Checks interfaces 1nmcli con show 2NAME UUID TYPE DEVICE 3ens192 4d0087a0-740a-4356-8d9e-f58b63fd180c ethernet ens192 4ens224 3dcb022b-62a2-4632-8b69-ab68e1901e3b ethernet ens224 5 6nmcli dev status 7DEVICE TYPE STATE CONNECTION 8ens192 ethernet connected ens192 9ens224 ethernet connected ens224 10ens256 ethernet connected ens256 11lo loopback unmanaged -- 12 13# Get interfaces details : 14nmcli connection show ens192 15nmcli -p con show ens192 16 17# Get DNS settings in interface 18UUID=$(nmcli --get-values connection.uuid c show "cloud-init eth0") 19nmcli --get-values ipv4.dns c show $UUID Changing Interface name 1nmcli connection add type ethernet mac "00:50:56:80:11:ff" ifname "ens224" 2nmcli connection add type ethernet mac "00:50:56:80:8a:0b" ifname "ens256" Create a custom config 1nmcli con load /etc/sysconfig/network-scripts/ifcfg-ens224 2nmcli con up ens192 Adding a Virtual IP 1nmcli con mod enp1s0 +ipv4.addresses "192.168.122.11/24" 2ip addr del 10.163.148.36/24 dev ens160 3 4nmcli con reload # before to reapply 5nmcli device reapply ens224 6systemctl status network.service 7systemctl restart network.service Add a DNS entry 1UUID=$(nmcli --get-values connection.uuid c show "cloud-init eth0") 2DNS_LIST=$(nmcli --get-values ipv4.dns c show $UUID) 3nmcli conn modify "$UUID" ipv4.dns "${DNS_LIST} ${DNS_IP}" 4 5# /etc/resolved is managed by systemd-resolved 6sudo systemctl restart systemd-resolved

August 26, 2023 2 min read Docs

🎶 Samba / CIFS

Docs SysAdmin Systems Unix-Like Disks Shared-Storage

Server Side First Install samba and samba-client (for debug + test) /etc/samba/smb.conf 1[home] 2Workgroup=WORKGROUP (le grp par defaul sur windows) 3Hosts allow = ... 4[shared] 5browseable = yes 6path = /shared 7valid users = user01, @un_group_au_choix 8writable = yes 9passdb backend = tdbsam #passwords are stored in the /var/lib/samba/private/passdb.tdb file. Test samba config testparm /usr/bin/testparm -s /etc/samba/smb.conf smbclient -L \192.168.56.102 -U test : list all samba shares available smbclient //192.168.56.102/sharedrepo -U test : connect to the share pdbedit -L : list user smb (better than smbclient)