Programmer Group

M-S Architecture: Achieving Dual Hot Standby (AB Replication) 1. Reducing master Reading Pressure 2. The database can be "hot-standby". Hot-standby can only solve the hardware and software faults of hardware master, but it can not solve the logic faults caused by human misoperation (such as deleting important records by incorrect in ...

1. Preparations Close the firewall Close selinux systemctl stop firewalld.service setenforce 0 && getenforce && \cp /etc/selinux/config{,.ori} && grep -q "SELINUX=disabled" /etc/selinux/config || sed -i 's%SELINUX=enforcing%SELINUX=disabled%g' /etc/selinux/config 2.Yum installs Samba packages ...

Article directory Common functions of Pandas Pandas grouping Break data into groups View grouping Iterative traversal grouping Select a group polymerization Use multiple aggregation functions at a time filter Pandas Merge/Connect Merge two DataFrame s on one key Merge two DataFrame s on multiple keys how parameter 3. Pan ...

Software management 1. yum: The most important function of the upper software management tool is to solve software dependency. The prerequisite for yum to be operational is that it must have a yum source and configure the source-to-file 1. Getting ISO Mirror Files Matching the System rhel-server-7.0-x86_64-dvd.iso 2. Mount the mirror file i ...

Virtual Machine Management I. Installing Virtual Machines with Local Mirrors 1. Graphic Interface Installation virt-manager ##Open Virtual Machine Manager File - > New Virtual Machine, select the local image Select the size of the immediate storage space and CPU Select allocated sto ...

virtualbox Installation of virtual machine under windows brings infinite convenience for learning ubuntu, and saves computer money at the same time uuuuuuuuuuu ubuntu Ubununtu is installed in the virtual machine. There are many teaching materials on the internet. Note: Storage space can not be the default 10G, it is easy to ...

1. Configuration of anti-theft chain To prevent people from using the function of file upload, put some static media resources on our website, and then set up the links of these resources on their website to our website. When users of their website visit these resources, they will jump to our server, resulting in an abnormal in ...

Tools needed: NERDTree Cscope ctags vundle homebrew(for mac) Catalog: Introduction to Software NERDTree Cscope ctags vundle homebrew mac installation ubuntu installation Introduction to Software NERDTree NERDTree is a vim plug-in that displays tree directories: Enter the tree interface of ...

Access control restriction php parsing Some files uploaded by users may be abnormally placed in the runnable files, so what we need to do is set up in advance to prohibit the parsing of executable php or other files in these directories, so as to avoid loss. Editing Virtual Machine Profile vim /usr/local/apache2.4/conf/extra/httpd-vhosts.c ...

Configuration of Dashboard dashboard service (Controller Node)1. Configure Dashboard# apt -y install openstack-dashboard # vim /etc/openstack-dashboard/local_settings.py     OPENSTACK_HOST = "192.168.30.145"             & ...