Linux Router and Firewall - SSN
This tutorial shows you how to setup a server for the sole purpose of being the DHCP server and firewall for our LAN. The purpose of having a Linux-based server/firewall is for the flexibility and in some cases, an improvement of bandwidth and speed outside to the internet, though the main purpose is truly is for flexibility. Any Linux distribution can be used for this purpose, but this tutorial w
RHEL7: How to get started with Firewalld. - CertDepot
CertDepot Everything you need to pass your RHCSA, RHCE, LFCS, LFCE and much more. Note: This is an RHCSA 7 exam objective and an RHCE 7 exam objective. Presentation Firewalld is the new userland interface in RHEL 7. It replaces the iptables interface and connects to the netfilter kernel code. It mainly improves the security rules management by allowing configuration changes without stopping the cu
革命の日々！ RHEL7でカーテン無効化
RHEL7でしばらくキーを操作しないでおくと、以下の様なカーテンが降りてくるけど、非常に鬱陶しい。 今回はこれのdisableの仕方。 % sudo yum install -y gnome-shell-browser-plugin で、firefoxにgnome-shell extensionを入れる。これで、ブラウザで、https://extensions.gnome.org を 閲覧すると、インストールしまっかと聞いてくるようになる。 https://extensions.gnome.org/extension/730/curtains-up/ に curtainを disable するプラグインがあるので、これをインストール。 なお、パスワード入力はGnome標準の機能でdisableできるが、これがとんでもなく分かりにくいので ついでに紹介。 メニューバー右端の、自分の名前をクリ
Lotus Notes データベースからアイコン画像を取り出す(1)
If you’re looking for a developerWorks forum — Don't panic! You are in the right place. You are here because specific IBM developerWorks forums, blogs and other Connections content have been decommissioned. This page will help you find the content you are looking for, get answers to your questions, and find a new community to call home. Where am I? You are on the IBM Community area, a collection o
yum を使用して、パッケージをインストールせずにダウンロードだけ行う - Red Hat Customer Portal
Environment Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 5 Issue How do I use yum to download a package without installing it? Resolution There are two ways to download a package without installing it. One is using the "downloadonly" plugin for yum, the other is using "yumdownloader" utility. Downloadonly plugi
When RHEL has multiple IPs configured, only one is reachable from a remote network. Or why does RHEL ignore packets when the route for outbound traffic differs from the route of incoming traffic? - Red Hat Customer Portal
Environment Red Hat Enterprise Linux (RHEL) 6 and later Issue Why does Red Hat Enterprise Linux 6 invalidate / discard packets when the route for outbound traffic differs from the route of incoming traffic? Why does Red Hat Enterprise Linux 6 differ from Red Hat Enterprise Linux 5 in handling asymmetrically routed packets? Why does Red Hat Enterprise Linux not respond to connection attempts to a s
RHEL(CentOS)6系でトラフィックをたくさん捌くサーバが死ぬ問題は6.5のkernel-2.6.32-431.el6以降で多分直る - このブログはURLが変更になりました
タイトルで言いたいことはすべて言った。 経緯 うちの場合はLVS+keepalivedなロードバランサなんだけど、ちょくちょくkernel panicになる問題が発生してた。 そこでcrashコマンドで解析してみた。crashコマンドの使い方はこちらが参考になる。Linux crash dump 読み方入門 # crash /boot/System.map-2.6.32-279.14.1.el6.x86_64 /usr/lib/debug/lib/modules/2.6.32-279.14.1.el6.x86_64/vmlinux /var/crash/127.0.0.1-2013-09-27-16\:21\:01/vmcore (snip) SYSTEM MAP: /boot/System.map-2.6.32-279.14.1.el6.x86_64 DEBUG KERNEL: /usr
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