| # Deleting all keys in redis that match a regular expression | |
| # General | |
| redis-cli [options] KEYS "prefix:*" | xargs redis-cli [options] DEL | |
| # If authorization is needed | |
| redis-cli -a <AUTH> KEYS "prefix:*" | xargs redis-cli -a <AUTH> DEL | |
| # If no authorization is needed | |
| redis-cli KEYS "prefix:*" | xargs redis-cli DEL |
| examples: | |
| 1). modify file using regular expression pattern single-line mode ( '.' and '\s' match '\n') | |
| perl -i -p0E 's|(<artifactId>api</artifactId>[^<]+<version>)(bbb)(</version>)|\1a\3|g' pom.xml | |
| 2). modify file using regular expression pattern multi-line mode | |
| perl -i -pE 's|(<artifactId>api</artifactId>[^<]+<version>)(bbb)(</version>)|\1a\3|g' pom.xml | |
| 3). do not modify file actually, just print the changed contents | |
| perl -p0E 's|(<artifactId>api</artifactId>[^<]+<version>)(bbb)(</version>)|\1a\3|g' pom.xml |
This installation is going to require 2 servers one acts as kerberos KDC server
and the other machine is going to be client. Lets assume the FQDN's are (here
cw.com is the domain name, make a note of the domain name here):
Important: Make sure that both systems have their hostnames properly set and both systems have the hostnames and IP addresses of both systems in
| # /etc/krb5.conf | |
| [logging] | |
| default = FILE:/var/log/krb5libs.log | |
| kdc = FILE:/var/log/krb5kdc.log | |
| admin_server = FILE:/var/log/kadmind.log | |
| [libdefaults] | |
| dns_lookup_realm = false | |
| ticket_lifetime = 24h |
| #dump http response | |
| tcpdump -s 0 -A 'src port 80 and tcp[((tcp[12:1]&0xf0)>>2):4]=0x48545450' | |
| tcpdump -s 0 -A 'src port 80 and tcp[((tcp[12:1]&0xf0)>>2):4]='$(python -c "print '0x' + ''.join(hex(ord(i))[2:] for i in 'HTTP')") | |
| #dump http post request, following two are equal, 0x504f5354 <-> POST | |
| tcpdump -s 0 -A 'dst port 80 and tcp[((tcp[12:1]&0xf0)>>2):4]=0x504f5354' | |
| tcpdump -s 0 -A 'dst port 80 and tcp[((tcp[12:1]&0xf0)>>2):4]='$(python -c "print '0x' + ''.join(hex(ord(i))[2:] for i in 'POST')") | |
| #dump http get request | |
| tcpdump -s 0 -A 'dst port 80 and tcp[((tcp[12:1]&0xf0)>>2):4]='$(python -c "print '0x' + ''.join(hex(ord(i))[2:] for i in 'GET ')") |
| ###################################### | |
| # | |
| # Generic makefile | |
| # | |
| # by George Foot | |
| # email: george.foot@merton.ox.ac.uk | |
| # | |
| # Copyright (c) 1997 George Foot | |
| # All rights reserved. | |
| # |
| #################################################### | |
| # Generic makefile - 万能Makefile | |
| # for compiling and linking C++ projects on Linux | |
| # Author: George Foot Modified:Jackie Lee | |
| #################################################### | |
| ### Customising | |
| # | |
| # Adjust the following if necessary; EXECUTABLE is the target | |
| # executable's filename, and LIBS is a list of libraries to link in | |
| # (e.g. alleg, stdcx, iostr, etc). You can override these on make's |
| * install | |
| # yum install postgresql-server postgresql-contrib | |
| # postgresql-setup initdb | |
| * allow passowrd authentication & remote access | |
| # vi /var/lib/pgsql/data/pg_hba.conf | |
| host all all 127.0.0.1/32 ident | |
| host all all ::1/128 ident | |
| -> | |
| host all all 127.0.0.1/32 md5 |
| - prepare work | |
| a. make cm node can ssh to all nodes without password | |
| ssh-genkey, ssh-copy-id | |
| b. hostname mapping | |
| c. mysql server | |
| d. postgresql | |
| e. ntp | |
| systemctl disable chrony | |
| centos7 default enable chrony server, even enable ntpd, cuase chrony started, ntpd will not started | |
| this will cause CDH ntp error, so need to disable chrony. |
| Question: | |
| . How to run Ansible without specifying the inventory but the host directly? | |
| . Run a playbook or command with arbitrary host not in the inventory hosts list? | |
| . run ansible with arbitrary host/ip without inventory? | |
| Answer: | |
| Surprisingly, the trick is to append a , | |
| The host parameter preceding the , can be either a hostname or an IPv4/v6 address. | |
| ansible all -i example.com, |