Programmer Group

Problem Description:After adding Oracle users, the development feedback can connect PING to the host and Telnet to the corresponding port. Client screenshots are as follows: Problem analysis:Maybe in the process of multi-user operation, or in the process of creating users, the operation errors of time privilege which set the membership gro ...

iptables rule backup and recovery 9 zone s of firewalld   System CTL disable iptables boot on System CTL stop iptables turn off service System CTL enable firewalld boot System CTL start firewalld opens the service View all zone s [root@glinux-01 ~]# firewall-cmd --get-zones block dmz drop external home internal public trusted work ...

Some time ago, I received a request to dock a tool class written by C # and upload data to our system background. Demand is not difficult, very common, so for convenience. So I wrote (java framework SSH): C# Code to simulate requests public static void Main(string[] args) { String postData = fileToString ...

Deploying docker-based CEPH cluster using ceph-ansible Install ansible Download ceph-ansible Configure ceph-ansible Start deployment Destroying Clusters (Caution) Install ansible For installing ansible and configuring secret-free login between nodes, this is not covered here. Please refer to Official Documents. Downlo ...

Overview of Automation Operation and Maintenance: Nowadays, with the rapid development of the Internet, the efficiency of traditional operation and maintenance methods is too low. Deployment of automated operation and maintenance can safely and efficiently complete the maintenance work, which has become the main mode of operation and maintena ...

Catalog 1 awk command 1 awk command Copy exercise files [root@worker1 dir9]# cp /etc/passwd ./testpasswd Print the first field [root@worker1 dir9]# head -n2 testpasswd | awk -F ':' '{print $1}' ROOT bin Print entire line [root@worker1 dir9]# head -n2 testpasswd | awk -F ':' '{print $0}' ROOT:x:0:0:roooot:/root:/bin/ ...

system log I. Management of System Log cat /var/log/messages ##View the default saved logs 1. Management of log collection service rsyslog /var/log/messages ##Service Information Log /var/lgo/secure ##System login log /var/log/cron ##Timing Task Log /var/log/maillog ##Mail l ...

Introduction to YAML: * YAML is a format used to express data sequences. YAML is the abbreviation of YAML Ain't Markup Lanaguage, that is, YAML is not XML. * characteristics: 1. It has good continuity and is easy to implement. 2. Strong expressive ability and good expansibility; 3. Good interaction with scripting language; 4. H ...

Fault phenomena: [root@web-m data]# git clone ssh://git@gitlab.lixinkuan.com:22022/lxk/core.git Cloning into 'core'... git@gitlab.lixinkuan.com's password: Permission denied, please try again. git@gitlab.lixinkuan.com's password: Permission denied, please try again. git@gitlab.lixinkuan.com's password: Permission denied (publickey,gssapi-ke ...

Manual HA 1. If you are creating a brand new HA cluster, please complete this article first. Blog The first 18 steps. 2,modify core-site.xml <property> <name>fs.defaultFS</name> <value>hdfs://mycluster</value> </property> <property> <name>hadoop.tmp.dir</name> &l ...