Sysops Notepad

/bin/false allows a login, but no shell, no ssh tunnels and no home directory. 시스템의 로그인/FTP/ssh/shell은 불가능 /sbin/nologin disallows logins completely and returns a polite account unavailable message. 시스템의 로그인/ssh/shell은 불가능, FTP 가능

# vi /sbin/dhclient-script ifconfig $interface:0- inet 0 ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg /sbin/ip route replace ${alias_ip_address}/32 dev $interface:0 fi fi if [ -z "${dhc_dbus}" ] || (( ( dhc_dbus & 1 ) != 1 )); then # make_resolv_conf

[root@sre-tech-tpl6-dev-001 ~]# ls -al --time-style=+%D | grep `date +%D` dr-xr-x--- 12 root root 4096 05/06/22 . -rw------- 1 root root 28428 05/06/22 .bash_history

기본값 [root@ ~]# cat /proc/sys/vm/drop_caches 0 buffers/cached 캐시 삭제 echo 3 > /proc/sys/vm/drop_caches 참고 0: 기본 (캐시 메모리를 drop하지 않음) 1: 페이지 캐시 해제 2: dentry, inode 캐시 해제 3: 페이지, dentry, inode 캐시 해제

[root@test ~]# ls --time-style=long-iso -al total 156 dr-xr-x--- 12 root root 4096 2022-05-06 13:22 . drwxr-xr-x 18 root root 4096 2022-04-01 14:02 .. -rw------- 1 root root 1201 2021-11-19 22:38 anaconda-ks.cfg drwx------ 3 root root 4096 2022-03-31 12:01 .ansible -rw-r--r-- 1 root root 804 2022-02-03 10:50 authorized_keys -rw------- 1 root root 28346 2022-05-06 13:22 .bash_history -rw-r--r-- 1..

fstab.conf에 잘못된 설정을 넣어서 리부팅 후 Repair Filesystem 부팅되고 / 파티션이 Read-only 상태로 마운트되었을때 조치 방법입니다. mount -o remount,rw /

사전작업 # yum install -y pcre2-devel zlib-devel openssl-devel systemd-devel compile cd /home/temp/ wget http://www.haproxy.org/download/2.4/src/haproxy-2.4.8.tar.gz tar zxvf haproxy-2.4.8.tar.gz cd haproxy-2.4.8 make TARGET=linux-glibc \ USE_OPENSSL=1 USE_ZLIB=1 USE_SYSTEMD=1 \ USE_PCRE2=1 USE_PCRE2_JIT=1 make PREFIX=/home/haproxy install ln -sf /home/haproxy/sbin/haproxy /usr/local/bin/haproxy

# lshw -short H/W path Device Class Description ========================================================== system ProLiant DL20 Gen10 (P06962-B21)

SSL / TLS 통신 과정을 상세하게 정리한 좋은 사이트를 발견해서 공유드립니다. https://tls.ulfheim.net/ The Illustrated TLS Connection: Every Byte Explained Client Key Exchange The client provides information for key exchange. As part of the key exchange process both the server and the client will have a keypair of public and private keys, and will send the other party their public key. The shared encryption k tls.ulfheim.net ..

rocky linux 8에 td-agent-bit를 설치간에 아래와 같이 에러가 발생했습니다. [root@test td-agent-bit]# /opt/td-agent-bit/bin/td-agent-bit -h /opt/td-agent-bit/bin/td-agent-bit: error while loading shared libraries: libssl.so.10: cannot open shared object file: No such file or director 이럴때는 아래 패키지를 설치해주시면 해결됩니다. [root@test ~]# yum install compat-openssl10 그럼 수고하세요~