File permissions for virtual pop inboxes in DirectAdmin
Any domains that you want to use for email (eg: mydomain.com) must be in both the /etc/virtual/domains file and the /etc/virtual/domainowners file.
The directory /etc/virtual/mydomain.com must exist and the files /etc/virtual/mydomain.com/passwd and /etc/virtual/mydomain.com/aliases exist.
File permissions for virtual pop inboxes should be the following below but not applicable with Dovecot/Maildir:
/var/spool/virtual/domain.com 770 username:mail
/var/spool/virtual/domain.com/* 660 username:mail
Tags: DirectAdmin Support, file, inboxes, permissions, pop, virtual
Creating your own SSL certificate for DirectAdmin
Note : that this is for the DirectAdmin connection on port 2222.
You can switch DirectAdmin to use SSL instead of plain text. -> https instead of http on port 2
If you do not have your own certificates, you’ll need to create your own:
/usr/bin/openssl req -x509 -newkey rsa:1024 -keyout /usr/local/directadmin/conf/cakey.pem -out /usr/local/directadmin/conf/cacert.pem -days 9999 -nodes
And then
chown diradmin:diradmin /usr/local/directadmin/conf/cakey.pem
chmod 400 /usr/local/directadmin/conf/cakey.pem
Edit the /usr/local/directadmin/conf/directadmin.conf and set SSL=1 (default is 0). This tells DA to load the certificate and key and to use an SSL connection. DirectAdmin needs to be restarted after this change.
Tags: certificate, Creating, DirectAdmin Support, ssl
Shared Memory?
Shared memory (SHM) is another method of interprocess communication (IPC) whereby 2 or more processes share a single chunk of memory to communicate. The shared memory system can also be used to set permissions on memory, allowing for things like malloc debuggers to be written.
Types of Shared memory available
Basically there are two different types of shared memory available for most flavors of UNIX. As you may have guessed, each of the two orignal ancestors of modern UNIX have their own implementation, altough almost all modern UNIX flavors implement both. The names of the respective implementations are System V IPC, and BSD mmap.
Tags: memory, Shared
Checking system default VM setting using sysctl
Some of the VM settings for the kernel can be changed using sysctl. Here is a listing of the default settings for a system on 2.6.27
root@dell:~# sysctl -a |grep vm
vm.overcommit_memory = 0
vm.panic_on_oom = 0
vm.oom_kill_allocating_task = 0
vm.oom_dump_tasks = 0
vm.overcommit_ratio = 50
vm.page-cluster = 3
vm.dirty_background_ratio = 10
vm.dirty_ratio = 40
vm.dirty_writeback_centisecs = 499
vm.dirty_expire_centisecs = 2999
vm.nr_pdflush_threads = 2
vm.swappiness = 60
vm.nr_hugepages = 0
vm.hugetlb_shm_group = 0
vm.hugepages_treat_as_movable = 0
vm.nr_overcommit_hugepages = 0
vm.lowmem_reserve_ratio = 256 32 32
vm.drop_caches = 0
vm.min_free_kbytes = 2033
vm.percpu_pagelist_fraction = 0
vm.max_map_count = 65536
vm.laptop_mode = 0
vm.block_dump = 0
vm.vfs_cache_pressure = 100
vm.legacy_va_layout = 0
vm.stat_interval = 1
vm.mmap_min_addr = 0
vm.vdso_enabled = 2
vm.highmem_is_dirtyable = 0
Tags: Checking, sysctl, System, VM
Installing C++ preprocessor in DirectAdmin
If you encounter this error message, this would imply that you do not have g++ installed:
checking whether we are using the GNU C++ compiler… no
checking whether g++ accepts -g… no
checking dependency style of g++… none
checking how to run the C++ preprocessor… /lib/cpp
*** The make has failed, do you want to try to make again? (y,n):
The gcc-c++ rpm and all it’s dependancies are required to resolve the issue.
Some dependancies include:
libstdc++-devel
libstdc++
If you have up2date, simply run:
or
Source include: http://directadmin.com/
Tags: Add new tag, C++, DirectAdmin Support, installing, preprocessor
