root@OpenWrt :~# df -h Filesystem                Size      Used Available Use% Mounted on /dev/root               102.3M     27.3M     73.0M  27% / tmpfs                     3.8G    328.0K      3.8G   0% /tmp tmpfs                   512.0K         0    512.0K   0% /dev

In fact, the hard disk space of soft routing is very large, which causes waste! And the default size is difficult to meet the size requirements of the hard disk for installing some plug-ins, so it needs to be reallocated!

The simplest allocation method is to directly use the remaining space, and then use the mount point to directly allocate this space to the root directory.

one

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Plug ins include:

 block-mount mount-utils libmount1

After installing from the source, restart the soft route.

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 [   65.613323] i915 0000:00:02.0: [drm] Failed to load DMC firmware i915/glk_dmc_ver1_04.bin. Disabling runtime power management. [   65.624794] i915 0000:00:02.0: [drm] DMC firmware homepage:  https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmwa

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Here, the wireless network card model I use is: RTL8822CE , supports 2.4G and 5G frequency bands, is compatible with 802.11AC/A/B/G/N, and supports up to 867Mbps.

In OpenWrt's kmods Source, can

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SSH Profile /etc/ssh/sshd_config There is such a line in

 # AuthorizedKeysFile      .ssh/authorized_key

If you enable Key login, we usually delete the key in front of this line # However, it is easy to ignore that the files of other systems are .ssh/authorized_keys And here it is

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In short, in the daily use process, there are such situations as signal without network, stuck, slow download speed, network delay, etc.

For example, the network signal is clearly full, but login to WeChat still shows that the current network is unavailable; Another example is listening to online music and suddenly buffering off and on.

2、 Cause analysis

After consulting online materials and analysis, it can be determined that it is basically related to TSO services.

The full name of TSO is TCP Segmentation Offload, that is, TCP Segmentation Offload, also known as LSO, Large Send Offload）。 Segmentation refers to dividing large data blocks into smaller data segments. Unloading refers to the practice of moving workload from CPU to network card. Uninstalling this work can save CPU cycles and generally improve packet processing performance. That is, TSO is a technology that uses a small amount of processing power of the network card to reduce the load of data packets sent by the CPU, Support of network card hardware and driver is required 。

To put it simply, the TSO service is abnormal due to driver or hardware problems, such as insufficient heat dissipation. In this case, just turn off the TSO service.

3、 Operation command

1. Esxi kernel

That is, VMKernel, which is connected to the Esxi master through SSH for execution.

1. View Command

List network cards:

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1、 What are VNC connections and serial connections?

In simple terms, it means that a channel is opened in the master machine above the virtual machine to connect to the virtual machine. As for VNC or serial, it is essentially the same, depending on which is convenient for you to use.
VNC is generally used as a springboard to connect virtual machines, and serial is used to connect virtual machines directly.

In addition, VNC connection and serial connection, to be exact, should be called VNC console connection and serial console connection.

2、 Use Prerequisites

For the convenience of explanation, simply draw a flow chart

Client computer A --->computer creating connection B --->Oracle connection created --->Oracle Cloud virtual machine actually to be connected

A and B can be the same computer.

For PC B:

1. Since the OCI command is used, the OCI environment needs to be configured before everything starts. See the previous article《 Oracle Cloud Oracle Cloud Object Storage ObjectStorage API (OCI) Detailed Instructions 》In Environment Configuration This section will not be repeated here.

For computers A and B:

2. The SSH key pair is also required. It can be the same as that used when creating an instance. The connection is encrypted by SSH in essence, so it needs to be prepared before starting. If the key format is wrong during configuration, see the article《 Oracle Cloud Oracle Cloud Console Add API Key Format Error 》Processing.

The above two are prerequisites for creating a connection. When using:

For PC A or B:

3. For Windows: plink.exe (The command link connection tool provided with PuTTY. You can install PuTTY or plink.exe separately);

For computer A, if you want to use VNC connection, you need to install support V first

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 /usr/local/oracle/lib/oracle-cli/lib/python3.6/site-packages/oc

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