Debugging the BPF Virtual Machine Lorenzo Fontana October 28, 2020 ● Debugging is useful to understand how things work ● Sometimes, eBPF programs can’t even load ● I couldn’t find good resources on this this, so, here I am ● I break lots of eBPF programs ● The BPF Virtual machine is not easy to understand Why ? The BPF subsystem lives in the kernel AND The kernel can be debugged using gdb The

3 Apache Virtual Host documentation 109 3.1 Apache Virtual Host documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 iii iv CONTENTS 3.2 Name-based Virtual Host Support . . . . . 111 3.3 Apache IP-based Virtual Host Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 3.4 Dynamically Configured Mass Virtual Hosting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 3.6 An In-Depth Discussion of Virtual Host Matching . . . . . . . . . . . . . . . . . . . . . . . . . . 129 3.7 File Descriptor Limits

............................................................................ 161 8. Domain Name Service (DNS) .......................................................................................... program. The Live Server installer uses a text-based console interface which runs on the default virtual console. The interface can be entirely driven by the enter, up and down arrow keys (with some occasional Section 5, “Automatic Updates” [p. 34]. • Manage the system with Landscape: Landscape is a paid service provided by Canonical to help manage your Ubuntu machines. See the Landscape8 site for details.

Contributions. 6. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing Windows, Apache is normally run as a service on Windows NT, 2000 and XP, or as a console application on Windows 9x and ME. For details, see Running Apache as a Service and Running Apache as a Console Application restarting Apache on Unix-like systems. Windows NT, 2000 and XP users should see Running Apache as a Service and Windows 9x and ME users should see Running Apache as a Console Application for information on

Contributions. 6. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing Windows, Apache is normally run as a service on Windows NT, 2000 and XP, or as a console application on Windows 9x and ME. For details, see Running Apache as a Service and Running Apache as a Console Application restarting Apache on Unix-like systems. Windows NT, 2000 and XP users should see Running Apache as a Service and Windows 9x and ME users should see Running Apache as a Console Application for information on

Contributions. 6. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing Windows, Apache is normally run as a service on Windows NT, 2000 and XP, or as a console application on Windows 9x and ME. For details, see Running Apache as a Service and Running Apache as a Console Application restarting Apache on Unix-like systems. Windows NT, 2000 and XP users should see Running Apache as a Service and Windows 9x and ME users should see Running Apache as a Console Application for information on

Contributions. 6. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing Windows, Apache is normally run as a service on Windows NT, 2000 and XP, or as a console application on Windows 9x and ME. For details, see Running Apache as a Service and Running Apache as a Console Application restarting Apache on Unix-like systems. Windows NT, 2000 and XP users should see Running Apache as a Service and Windows 9x and ME users should see Running Apache as a Console Application for information on

install/netboot-arm64 arm64 netboot install 3 install/netboot-ppc64el ppc64el netboot install 3 install/ppc64el Virtual CDROM and Petitboot on ppc64el 1 Level Path Navlink 3 install/s390x-zvm s390x install via z/VM dump 2 OpenLDAP 3 service-ldap-introduction Introduction 3 service-ldap Installation 3 service-ldap-access-control Access control 3 service-ldap-replication Replication 3 service-ldap-usage Simple management 3 service-ldap-with-tls SSL/TLS 3 service-ldap-backup-restore Backup and restore 2 Kerberos 3 kerberos-introduction Introduction 3 service-kerberos Kerberos server 3 service-kerberos-principals

3 Apache Virtual Host documentation 93 3.1 Apache Virtual Host documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 iii iv CONTENTS 3.2 Name-based Virtual Host Support . . . . . . 95 3.3 Apache IP-based Virtual Host Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 3.4 Dynamically configured mass virtual hosting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 3.6 An In-Depth Discussion of Virtual Host Matching . . . . . . . . . . . . . . . . . . . . . . . . . . 113 3.7 File Descriptor Limits

Contributions. 6. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing Windows, Apache is normally run as a service on Windows NT, 2000 and XP, or as a console application on Windows 9x and ME. For details, see Running Apache as a Service and Running Apache as a Console Application restarting Apache on Unix-like systems. Windows NT, 2000 and XP users should see Running Apache as a Service and Windows 9x and ME users should see Running Apache as a Console Application for information on