IT Articles – Information Technology Article
와우, 바쁜 한 주였습니다. 나는 remember.yahoo.com MySQL 서버 및 관련 항목을 다루는 며칠 동안 완전히 늪에 빠졌습니다. 그리고 하루나 이틀을 회복하는 데 사용했습니다 (수면, 샤워 등). 어쨌든, 나는 그 과정에서 몇 가지 흥미로운 발견을 했다. 가장 놀라운 것은 바쁜 MySQL 서버가 있을 때 Linux에서 스레드 캐싱과 관련이 있습니다. 아시다시피, 우리는 누군가가 변경할 때마다 모든 웹 … Read more
HP Switch ACL Configuration(HP 스위치 ACL 설정) ▶ 현재 설정 상태 확인 1) 방법 raonyn> display current-configuration# version 7.1.070, Release 6635#……………… ▶ config 모드로 진입 하기 raonyn> system-view ▶ telnet 또는 ssh 활성화 1) 방법 raonyn> system-view raonyn] telnet server enable or ssh server enable raonyn] user-interface vty 0 4 raonyn-line-vty0-4] authentication-mode schem raonyn] local-user admin raonyn-luser-manage-admin] service-type terminal ( or telnet or ssh) => mode none 을 하면 계정 및 패스워드를 안묻고 로그인 가능 => mode schem 을 해줘야 계정으로 로그인 가능 => local-user 계정에서 service-type에 telnet이나 ssh를 설정해야 로그인 가능 ▶ 계정 생성 1) 방법 raonyn> system-view – 계정 생성 raonyn] local-user raonyn – 패스워드 생성 raonyn-luser-manage-raonyn] password simple password Updating user information. Please wait… … – 계정에 접근 서비스 결정 raonyn-luser-manage-raonyn] service-type terminal ( or telnet or ssh) – 계정 롤 설정 (예: network-admin) raonyn-luser-manage-raonyn] authorization-attribute user-role network-admin ▶ NTP 서버 연동 1) 방법 raonyn> system-view – ntp service enable raonyn] ntp-service enable – ntp service 동기화 서버 지정 raonyn] ntp-service unicast-server 1.1.1.1 raonyn]display ntp-service status Clock status: synchronized <== 동기화 상태 Clock stratum: 4 System peer: 1.1.1.1 <== 동기화 대상 서버 Local mode: client Reference clock ID: 1.1.1.1 Leap indicator: 00 Clock jitter: 0.000458 s Stability: 0.000 pps Clock precision: 2^-21 Root delay: 6.31714 ms Root dispersion: 11.64246 ms Reference time: e6e7a612.fa350119 Wed, Oct 5 2022 15:43:30.977 System poll interval: 64 s ▶ snmp 허용 1) 방법 raonyn> system-view – snmp 버전 지정 raonyn] snmp-agent sys-info version v1 v2c – snmp 정보 획득을 위한 커뮤니티 값 설정 raonyn] snmp-agent community read community raonyn] display snmp-agent statistics 249175 messages delivered to the SNMP entity. 0 messages were for an unsupported version. 0 messages used an unknown SNMP community name. 2) ACL snmp-agent community read public acl …2001 => acl은 명령어 마지막에 acl 2000~ 으로 해주면 됩니다. Acl number 2000 name SNMP rule 1 permit source X.X.X.X 0 (허용해줄 IP), 나머지 차단 ▶ ssh 기본 acl 생 [HPE]acl basic 2000[HPE-acl-ipv4-basic-2000]rule 10 deny ip source 20.20.20.11 0 destination 20.20.20.1 0 counting[HPE-acl-ipv4-basic-2000]rule 70 permit source 192.168.120.51 0 ▶ password-recovery 1) 방법 – 부팅시 Ctrl+B 클릭 8. Skip Authentication for Console Login Clear Image Password Success! – 샤시 장비와, 일반 스위치와 조금 다를 수 있으며, 샤시 장비는 MPU 모듈 하나를 제거 한 상태에서만 리커버리가 됨. ■ SNMPv1/SNMPv2c configuration example Configuring the SNMP agent. Configure the IP address of the agent and make sure that the agent and the NMS can reach each other. Specify SNMPv1 and SNMPv2c, create a read-only community public , and a read and write community private. <Agent> system-view [Agent] snmp-agent sys-info version v1 v2c [Agent] snmp-agent community read public [Agent] snmp-agent community write privateConfigure contact and physical location information for the agent. [Agent] snmp-agent sys-info contact Mr.Wang-Tel:3306 [Agent] snmp-agent sys-info location telephone-closet,3rd-floor Enable SNMP traps, set the NMS at 1.1.1.2/24 as an SNMP trap destination, and use public as the community name. (To be sure that the NMS can receive traps, specify the same SNMP version in the snmp-agent target-host command as on the NMS.) [Agent] snmp-agent trap enable [Agent] snmp-agent target-host trap address udp-domain 1.1.1.2 params securityname public v1 [Agent] quit Configure the SNMP NMS. The SNMP settings on the agent and the NMS must match. Specify the read-only community, the read and write community, the timeout time, and the number of retries. Verify the configuration. Try to get the count of sent traps from the agent, and the attempt succeeds. Send request to 1.1.1.1/161 … Protocol version: SNMPv1 Operation: Get Request binding: 1: 1.3.6.1.2.1.11.29.0 Response binding: 1: Oid=snmpOutTraps.0 Syntax=CNTR32 Value=18 Get finishedUse a wrong community name to get the value of a MIB node from the agent, and see an authentication failure trap on the NMS. 1.1.1.1/2934 V1 Trap = authenticationFailure SNMP Version = V1 Community = public Command = Trap Enterprise = 1.3.6.1.4.1.43.1.16.4.3.50 GenericID = 4 SpecificID = 0 Time Stamp = 8:35:25.68
The 40 Most-Used Linux Commands Before jumping into the most-used Linux commands, make sure to fire up a terminal. In most Linux distributions, you would use Ctrl + Alt + T to do so. If this isn’t working, search in your application panel for “terminal.” The Linux terminal emulator. Now let’s dive into the 40 most-used Linux commands. … Read more
